case study of chapter 2 science class 10

Case Study Questions Class 10 Science Chapter 2 Acids, Bases, and Salts

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CBSE Board Exam is on the way, so you must practice some good Case Study Questions Class 10 Science to boost your preparation to score 95+% on Boards. In this post, you will get Case Study and Passage Based Questions that will come in CBSE Class 10 Science Board Exams.

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In CBSE Class 10 Science Paper, Students will have to answer some questions based on  Assertion and Re a son . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Acids, Bases, and Salts Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 10 Science  Chapter 2 Acids, Bases, and Salts

Case Study/Passage-Based Questions

Case Study 1:

A compound, X of sodium forms a white powder. It is a constituent of baking powder and is used in some antacids. When heated it gives a compound, Y which is anhydrous and absorbs water to become a hydrated salt. When this salt is kept in the open air, it loses water molecules in a process called efflorescence. When dissolved in water it forms a strong base and a weak acid, Z.

(i) What is the compound, X?

Answer: (c) NaOH.

(ii) The compound, Y is

Answer: (c) Na2CO3.10H2O

(iii) What is the nature of the solution formed by dissolving Y in water?

Answer: (a) Alkaline

(iv) Identify the compound, Z.

Answer: (b) H2CO3

(v) Sodium carbonate is a basic compound because it is a salt of a

Answer: (c) strong acid and weak base

Case Study 2:

pH is quite useful to us in a number of ways in daily life. Some of its applications are:

Control of pH of the soil : Plants need a specific pH range for proper growth. The soil may be acidic, basic, or neutral depending upon the relative concentration of H* and OH-. The pH of any soil can be determined by using pH paper. If the soil is too acidic, it can be corrected by adding lime to it. If the soil is too basic, it can be corrected by adding organic manure which contains acidic materials.

Regaining shine of a tarnished copper vessel by use of acids :  A copper vessel gets tarnished due to formation of an oxide layer on its surface. On rubbing lenion on the vessel, the surface is cleaned and the vessel begins to shine again. This is due to the fact that copper oxide is basic in nature, which reacts with the acid (citric acid) present in lemon to form a salt (copper citrate) which is washed away with water. As a result, the layer of copper oxide is removed from the surface of the vessel and the shining surface is exposed.

Self-defence by animals through chemical warfare :  Stings of bees and ants contain methanoic acid. When stung, it causes lot of pain and irritation. This can be cured by rubbing the affected area with mild base like baking soda.

(i) When black copper oxide placed in a beaker is treated with dilute HCl, its color changes to ( a) white (b) dark red (c) bluish-green (d) no change.

Answer: (c) bluish green

(ii) P is an aqueous solution of acid and Q is an aqueous solution of base. When these two are diluted separately, then (a) pH of P increases while that of Q decreases till neutralization.

(b) pH of P decreases while that of Q increases till neutralization. (C) pH of both P and Q decrease. (d) pH of both P and Q increase.

Answer: (a) pH of P increases while that of Q decreases till neutralisation.

(iii) Which of the following acids is present in bee sting? (a) Formic acid (b) Acetic acid (c) Citric acid (d) Hydrochloric acid

Answer: (c) Citric acid

(iv) Sting of ant can be cured by rubbing the affected area with soap because (a) it contains oxalic acid which neutralises the effect of formic acid (b) it contains aluminium hydroxide which neutralises the effect of formic acid (c) it contains sodium hydroxide which neutralises the effect of formic acid (d) none of these

Answer: (c) it contains sodium hydroxide which neutralises the effect of formic acid

(v) The pH of soil X is 7.5 while that of soil Y is 4.5. Which of the two soils, should be treated with powdered chalk to adjust its pH? (a) X only (b) Y only (c) Both X and Y (d) none of these

Answer: (b) Y only

Case Study 3: Acids, bases, and salts are essential substances in our daily lives and play crucial roles in various chemical reactions and processes. Acids are sour-tasting substances that can donate hydrogen ions (H+) when dissolved in water. They turn blue litmus paper red and have a pH value less than 7. Bases, on the other hand, are bitter-tasting substances that can accept hydrogen ions or donate hydroxide ions (OH-) when dissolved in water. They turn red litmus paper blue and have a pH value greater than 7. Salts are formed when acids react with bases, resulting in the neutralization process. They are formed by the combination of positive ions (cations) from bases and negative ions (anions) from acids. Understanding the properties and uses of acids, bases, and salts is important in various applications, such as in the preparation of medicines, household cleaning agents, and agricultural practices.

What are acids? a) Substances that can donate hydrogen ions when dissolved in water b) Substances that can accept hydrogen ions when dissolved in water c) Substances that turn blue litmus paper red d) Substances with a pH value less than 7 Answer: a) Substances that can donate hydrogen ions when dissolved in water

How are bases characterized? a) Sour-tasting substances b) Substances that can donate hydrogen ions c) Substances that turn red litmus paper blue d) Substances with a pH value less than 7 Answer: c) Substances that turn red litmus paper blue

What are salts formed from? a) Acids and bases b) Acids and metals c) Bases and metals d) Bases and water Answer: a) Acids and bases

What is the pH value of acids? a) Less than 7 b) Equal to 7 c) Greater than 7 d) Variable Answer: a) Less than 7

In which applications are acids, bases, and salts commonly used? a) Preparation of medicines b) Household cleaning agents c) Agricultural practices d) All of the above Answer: d) All of the above

Hope the information shed above regarding Case Study and Passage Based Questions for Class 10 Science Chapter 2 Acids, Bases, and Salts with Answers Pdf free download has been useful to an extent. If you have any other queries about CBSE Class 10 Science Acids, Bases, and Salts Case Study and Passage Based Questions with Answers, feel free to comment below so that we can revert back to us at the earliest possible. By Team Study Rate

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Class 10 Science: Case Study Chapter 2 Acids, Bases, and Salts PDF Download

In CBSE Class 10 Science Paper, Students will have to answer some questions based on  Assertion and Reason . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given.

Here we are providing you with Class 10 Science Chapter 2 Acids, Bases, and Salts Case Study Questions, by practicing this Case Study and Passage Based Questions will help you in your Class 10th Board Exam.

Case Study Chapter 2 Acids, Bases, and Salts

Here, we have provided case-based/passage-based questions for Class 10 Science  Chapter 2 Acids, Bases, and Salts

Case Study/Passage-Based Questions

Question 1:

A compound, X of sodium forms a white powder. It is a constituent of baking powder and is used in some antacids. When heated it gives a compound, Y which is anhydrous and absorbs water to become a hydrated salt. When this salt is kept in the open air, it loses water molecules in a process called efflorescence. When dissolved in water it forms a strong base and a weak acid, Z.

(i) What is the compound, X?

Answer: (c) NaOH.

(ii) The compound, Y is

Answer: (c) Na2CO3.10H2O

(iii) What is the nature of the solution formed by dissolving Y in water?

Answer: (a) Alkaline

(iv) Identify the compound, Z.

Answer: (b) H2CO3

(v) Sodium carbonate is a basic compound because it is a salt of a

Answer: (c) strong acid and weak base

Question 2:

pH is quite useful to us in a number of ways in daily life. Some of its applications are:

Control of pH of the soil : Plants need a specific pH range for proper growth. The soil may be acidic, basic, or neutral depending upon the relative concentration of H* and OH-. The pH of any soil can be determined by using pH paper. If the soil is too acidic, it can be corrected by adding lime to it. If the soil is too basic, it can be corrected by adding organic manure which contains acidic materials.

Regaining shine of a tarnished copper vessel by use of acids :  A copper vessel gets tarnished due to formation of an oxide layer on its surface. On rubbing lenion on the vessel, the surface is cleaned and the vessel begins to shine again. This is due to the fact that copper oxide is basic in nature, which reacts with the acid (citric acid) present in lemon to form a salt (copper citrate) which is washed away with water. As a result, the layer of copper oxide is removed from the surface of the vessel and the shining surface is exposed.

Self-defence by animals through chemical warfare :  Stings of bees and ants contain methanoic acid. When stung, it causes lot of pain and irritation. This can be cured by rubbing the affected area with mild base like baking soda.

(i) When black copper oxide placed in a beaker is treated with dilute HCl, its color changes to ( a) white (b) dark red (c) bluish-green (d) no change.

Answer: (c) bluish green

(ii) P is an aqueous solution of acid and Q is an aqueous solution of base. When these two are diluted separately, then (a) pH of P increases while that of Q decreases till neutralization.

(b) pH of P decreases while that of Q increases till neutralization. (C) pH of both P and Q decrease. (d) pH of both P and Q increase.

Answer: (a) pH of P increases while that of Q decreases till neutralisation.

(iii) Which of the following acids is present in bee sting? (a) Formic acid (b) Acetic acid (c) Citric acid (d) Hydrochloric acid

Answer: (c) Citric acid

(iv) Sting of ant can be cured by rubbing the affected area with soap because (a) it contains oxalic acid which neutralises the effect of formic acid (b) it contains aluminium hydroxide which neutralises the effect of formic acid (c) it contains sodium hydroxide which neutralises the effect of formic acid (d) none of these

Answer: (c) it contains sodium hydroxide which neutralises the effect of formic acid

(v) The pH of soil X is 7.5 while that of soil Y is 4.5. Which of the two soils, should be treated with powdered chalk to adjust its pH? (a) X only (b) Y only (c) Both X and Y (d) none of these

Answer: (b) Y only

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Class 10 Science Chapter 2 Case Based Questions - Acids, Bases and Salts

Case Study - 1

A scale for measuring hydrogen ion concentration in a solution, called pH scale has been developed. The p in pH stands for ‘potenz’ in German, meaning power. On the pH scale we can measure pH generally from 0 (very acidic) to 14 (very alkaline). pH should be thought of simply as a number which indicates the acidic or basic nature of a solution. Higher the hydronium ion concentration, lower is the pH value.

Answer the following on the basis of above paragraph: Q1: What does the scale represent when pH value increases from 7 to 14? Ans: It represents an increase in OH- ions concentration in the solution i.e. the increment in the strength of alkali. Q2: What is the pH value of milk of magnesia? Ans: It is 10. Q3: What are the important of pH in everyday life? Ans: We human beings, plants and animals all are sensitive to pH i.e. their body  work on normal pH such as plants grow between the pH range of 6 to 8. Our human body work within the pH range of 7 to 7.8. Q4: What happens when the pH of mouth is lower than 5.5? Ans:  Tooth decay starts in which the enamel gets corroded due to the much production of acids in mouth by bacteria. Q5: Two solutions X&Y. The pH of X is 4 and the pH of Y is 7. What is the nature of two solution? Ans:  Solution X is acidic in nature and the solution Y is neutral in nature.

Case Study - 2

Salts of a strong acid and a strong base are neutral with pH value of 7. On the other hand, salts of a strong acid and weak base are acidic with pH value less than 7 and those of a strong base and weak acid are basic in nature, with pH value more than 7.

Answer the following in reference to the above paragraph: Q1: Classify the following as strong bases and weak bases: KOH, NaOH, CsOH, NH4OH Ans: Strong bases:  KOH, NaOH, CsOH Weak base:  NH 4 OH Q2: Write a reaction of a strong acid and a weak base? Ans:  HCl(aq) + NH 4 OH(aq) → NH 4 Cl(aq) + H 2 O(aq) Q3: What happens when strong acids and bases react to each other? Explain by giving example. Ans: HCl + NaOH → NaCl + H 2 O i.e. neutral salt is formed. Q4: Identify the following as strong acid: CH 3 COOH, H 2 SO 4 , HNO 3 , H 3 PO 4 , H 2 CO 3 , HCl. Ans:  Strong acid: HCl, HNO 3 ,   H 2 SO 4 . Q5: Classify the following acis as strong or weak acid: acetic acid, citric acid, tartaric acid, oxalic acid. Ans:  All are weak acid present in  fruits and vegetables.

Case Study - 3

Sodium hydroxide When electricity is passed through an aqueous solution of sodium chloride (called brine), it decomposes to form sodium hydroxide. The process is called the chlor-alkali process because of the products formed– chlor for chlorine and alkali for sodium hydroxide.

Based on the above given information, answer the following questions: Q1: Write the chemical equation involved in this process? Ans: 2NaCl (aq)+ 2H 2 O(l) → 2 NaOH(aq) + Cl 2 (g) + H 2 (g) Q2: What are the substance that are formed at anode and cathode on chlor- alkali process? Ans: At anode Chlorine gas & at cathode hydrogen gas are formed. Q3: What are the uses of chlorine? Ans: 

• Used for water treatment
• Disinfectants
• pesticides.

Q4: Where does the sodium hydroxide solution is formed? Ans: It is formed near the cathode. Q5: What are the uses of Sodium hydroxide? Ans:

• uses in making soaps and detergents
• artificial fibres
• paper making

Case Study - 4

Plaster of Paris On heating gypsum at 373 K, it loses water molecules and becomes calcium sulphate hemihydrate ( CaSO 4 .½ H 2 O ). This is called Plaster of Paris. Plaster of Paris is a white powder and on mixing with water, it changes to gypsum once again giving a hard solid mass. Water of crystallisation is the fixed number of water molecules present in one formula unit of a salt. Five water molecules are present in one formula unit of copper sulphate. Chemical formula for hydrated copper sulphate is Cu SO 4 . 5H 2 O. Now you would be able to answer the question whether the molecule of Na2CO3 .10H2O is wet.

Answer the following questions on the basis of the above paragraph: Q1: What is the molecular formula of gypsum? Ans:  CaSO 4 . 2H 2 O Q2: Write the equation of formation of plaster of paris by heating gypsum? Ans:  CaSO 4 . 2H 2 O + heat ⇒ CaSO 4 . 1/2 H 2 O + 1^1/2 H 2 O Q3: What are the uses of Plaster of Paris? Ans: It is used by doctor for supporting of fractured bones, to make toys etc. Q4: Give the equation when POP is mixed with water? Ans: CaSO4. 1/2H2O + 1^1/2 H2O ⇒ CaSO4. 2H2O Q5: What does this 2 denotes in CaSO 4 . 2 H 2 O? Ans: 2 denotes the two water molecules as water of crystallisation.

Case Study - 5

Take solutions of glucose, alcohol, hydrochloric acid, sulphuric acid, etc. n Fix two nails on a cork, and place the cork in a 100 mL beaker. Connect the nails to the two terminals of a 6 volt battery through a bulb and a switch, as shown in. Now pour some dilute HCl in the beaker and switch on the current. Repeat with dilute sulphuric acid. What do you observe?  Repeat the experiment separately with glucose and alcohol solutions. What do you observe now? Does the bulb glow in all cases?

Following the above paragraph, answer the following questions; Q1: What was the changes occur in case of acids i.e HCl, H2SO4? Ans: The bulbs will start glowing as it contains hydrogen ions H+ ions (aq) as cation and Cl- or SO4^2- as anion. Q2: Why do glucose and alcohol do not conduct electricity? Ans:  They do not contains free ions neither cation nor anion. To conduct electricity, free ions are required. Q3: Why do acids do not show acidic behaviour in absence of water? Ans:  Acidic behaviour are shown by releasing of H+ ions from acids. To dissociate into H+ ions, the acids need medium i.e water. Q4: Does rain water or distilled water will conduct electricity? Ans: Rain water will conduct electricity as it contains both positive and negative ions of different salts in it. Q5: Why do aqueous solution of acids conduct electricity? Ans: The acid contains Hydrogen ions in solutions as well as anions. Due to the presence of free ions they conduct electricity.

Case Study - 6

The reaction between carbon dioxide and calcium hydroxide (lime water), Calcium hydroxide, which is a base, reacts with carbon dioxide to produce a salt and water. Since this is similar to the reaction between a base and an acid, we can conclude that nonmetallic oxides are acidic in nature.

Based on the above paragraph answer the following questions: Q1: What is the nature of Carbon dioxide? Ans:  It is a non- metallic oxide as carbon belongs to non- metals group i.e P – Block elements group 6. Q2: Give another reaction of non- metallic oxide and a base? Ans: CO 2 (g) + 2NaOH(aq)→ Na 2 CO 3 (aq) + H 2 O(aq) Q3: Arrange the following bases in increasing order: NaOH, Ca(OH) 2 & Mg(OH) 2 . Ans:  Mg(OH) 2 < Ca(OH) 2 < NaOH. Q4: Write the complete reaction between calcium hydroxide and carbon dioxide with physical states? Ans:  Ca(OH) 2  (aq) + CO 2 (g) → CaCO 3 (s) + H 2 O(l) Q5: What is the nature of non- metallic oxide? Ans:  The non- metallic oxide are acidic in nature because when they dissolved in water, they form acidic substance turning blue litmus into red.

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Case Study Questions Class 10 Science

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Download Case study questions for CBSE class 10 Science in PDF format from the myCBSEguide App . We have the new pattern case study-based questions for free download. Class 10 Science case study questions

This article will guide you through:

What are case study questions?

• Sample Papers with Case Study questions
• Class 10 Science Case Study question examples
• How to get case-based questions for free?
• How to attempt the case-based questions in Science?

Questions based on case studies are some real-life examples. The questions are asked based on a given paragraph i.e. Case Study.  Usually, 4-5 questions are asked on the basis of the given passage. In most cases, these are either MCQs or assertion & reason type questions. Let’s take an example to understand. There is one paragraph on how nitrogen is generated in the atmosphere. On the basis of this paragraph, the board asks a few objective-type questions. In other words, it is very similar to the unseen passages given in language papers. But the real cases may be different. So, read this article till the end to understand it thoroughly.

What is CBE?

CBSE stands for competency-based education. The case study questions are part of this CBE. The purpose of CBE is to demonstrate the learning outcomes and attain proficiency in particular competencies.

Questions on Real-life Situations

As discussed the case study questions are based on real-life situations. Especially for grade 10 science, it is very essential to have the practical knowledge to solve such questions. Here on the myCBSEguide app, we have given many such case study paragraphs that are directly related to real-life implications of the knowledge.

Sample Papers with Case Study Questions

Class 10 Science Sample Papers with case study questions are available in the myCBSEguide App . There are 4 such questions (Q.No.17 to 20) in the CBSE model question paper. If you analyze the format, you will find that the MCQs are very easy to answer. So, we suggest you, read the given paragraph carefully and then start answering the questions. In some cases, you will find that the question is not asked directly from the passage but is based on the concept that is discussed there. That’s why it is very much important to understand the background of the case study paragraph.

CBSE Case Study Sample Papers

You can download CBSE case study sample papers from the myCBSEguide App or Student Dashboard. Here is the direct link to access it.

Case Study Question Bank

As we mentioned that case study questions are coming in your exams for the last few years. You can get them in all previous year question papers issued by CBSE for class 1o Science. Here is the direct link to get them too.

Class 10 Science Case Study Question Examples

As you have already gone through the four questions provided in the CBSE model question paper , we are proving you with other examples of the case-based questions in the CBSE class 10 Science. If you wish to get similar questions, you can download the myCBSEguide App and access the Sample question papers with case study-type questions.

Case-based Question -1

Read the following and answer any four questions: Salt of a strong acid and strong base is neutral with a pH value of 7. NaCl common salt is formed by a combination of hydrochloride and sodium hydroxide solution. This is the salt that is used in food. Some salt is called rock salt bed of rack salt was formed when seas of bygone ages dried up. The common salt thus obtained is an important raw material for various materials of daily use, such as sodium hydroxide, baking soda, washing soda, and bleaching powder.

• Phosphoric acid
• Carbonic acid
• Hydrochloric acid
• Sulphuric acid
• Blue vitriol
• Washing soda
• Baking soda
• Bleaching powder

Case-based Question -2

• V 1  + V 2  + V 3
• V 1  – V 2  +V 2
• None of these
• same at every point of the circuit
• different at every point of the circuit
• can not be determined
• 20 3 Ω 203Ω
• 15 2 Ω 152Ω

Case-based Question -3

• pure strips
• impure copper
• refined copper
• none of these
• insoluble impurities
• soluble impurities
• impure metal
• bottom of cathode
• bottom of anode

How to Attempt the Case-Based Questions in Science?

Before answering this question, let’s read the text given in question number 17 of the CBSE Model Question Paper.

All living cells require energy for various activities. This energy is available by the breakdown of simple carbohydrates either using oxygen or without using oxygen.

See, there are only two sentences and CBSE is asking you 5 questions based on these two sentences. Now let’s check the first questions given there.

Energy in the case of higher plants and animals is obtained by a) Breathing b) Tissue respiration c) Organ respiration d) Digestion of food

Now let us know if you can relate the question to the paragraph directly. The two sentences are about energy and how it is obtained. But neither the question nor the options have any similar text in the paragraph.

So the conclusion is, in most cases, you will not get direct answers from the passage. You will get only an idea about the concept. If you know it, you can answer it but reading the paragraph even 100 times is not going to help you.

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NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12

NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts

September 27, 2019 by Veerendra

NCERT Solutions For Class 10 Science Chapter 2 Acids And Bases:  In this article, we will provide you with NCERT Solutions For Class 10 Science Chapter 2 Acids And Bases .  Having proper knowledge of the theories, sufficient practice of the reactions, equations and formulas, and solving questions from the NCERT Chemistry books are very important if you want to score well in Science for Class 10 board exams as well as JEE and NEET. Going through the step-wise solutions for every question too is highly important to bag a good score.

NCERT Solutions For Class 10 Science Chapter 2 Notes for Acids And Bases  has been provided by India’s topmost Chemistry teachers. Also in this article, you will find the Step-wise explanation for each and every question. Going through them will help you in getting a better understanding of how to solve problems. Read on to find out NCERT Solutions for Class 10 Science Chapter 2 Exercise and Extra Questions.

NCERT Solutions for Class 10 Science Chapter 2 Acids and Bases

Before getting into the details of NCERT Solutions For Class 10 Science Chapter 2 Acids And Bases, let’s have an overview of topics & subtopics under NCERT Solutions for Class 10 Science Chapter 2 Activities:

• Acids, Bases And Salts
• Understanding The Chemical Properties Of Acids And Bases
• What Do All Acids And All Bases Have In Common?
• How Strong Are Acid Or Base Solutions?
• More About Salts

Free download NCERT Solutions for Class 10 Science Chapter 2 Acids And Bases PDF in Hindi Medium as well as in English Medium for CBSE, Uttarakhand, Bihar, MP Board, Gujarat Board, and UP Board students, who are using NCERT Books based on updated CBSE Syllabus for the session 2019-20.

• Acids, Bases and Salts Class 10 Page No 18
• Acids, Bases and Salts Class 10 Page No 22
• Acids, Bases and Salts Class 10 Page No 25
• Acids, Bases and Salts Class 10 Page No 28
• Acids, Bases and Salts Class 10 Page No 33
• Class 10 Chapter 2 Acids, Bases and Salts Chapter End Questions
• Class 10 Chapter 2 Acids, Bases and Salts MCQ (Multiple Choice Questions)
• अम्ल, क्षार एवं लवण कक्षा 10 विज्ञान हिंदी में
• Class 10 Acids Bases and Salts Important Questions
• Acids Bases and Salts Class 10 Notes
• Acids Bases and Salts NCERT Exemplar Solutions
• Acids, Bases and Salts Class 10 Extra Questions

NCERT Solutions for Class 10 Science Chapter 2 Intext Questions

Page Number: 18

Question 1 You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube ? Answer: (i) Put the red litmus paper in all the test tubes, turn by turn. The solution which turns red litmus to blue will be a basic solution. The blue litmus paper formed here can now be used to test the acidic solution. (ii) Put the blue litmus paper obtained above in the remaining two test-tubes, turn-by-turn. The solution which turns the blue litmus paper to red will be the acidic solution. (iii) The solution which has no effect on any litmus paper will be neutral and hence it will be distilled water.

Page Number: 22

Question 1 Why should curd and sour substances not be kept in brass and copper vessels ? Answer: Curd and sour substances should not be kept in brass and copper vessels because these and other sour food-stuffs contain acids which can react with the metal of the vessel to form poisonous metal compounds which can cause food poisoning and affect our health adversely.

Page Number: 25

Question 1 Why do HCl, HNO 3 , etc show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character ? Answer: H + ions in aqueous solution are responsible for acidic character. HCl, HNO 3 , etc. give H + ions in water while alcohol and glucose do not give H + ion in water. Therefore, alcohol and glucose do not show acidic character.

Question 2 Why does an aqueous solution of an acid conduct electricity ? Answer: The aqueous solution of an acid conducts electricity due to the presence of charged particles called ions in it.

Question 3 Why does dry HCl gas not change the colour of the dry litmus paper ? Answer: Dry HCl gas does not give H + ions and therefore does not change the colour of dry litmus paper.

Question 4 While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid ? Answer: While diluting an acid it is recommended that the acid should be added to water and not water to the acid because if water is added to concentrated acid to dilute it, then a large amount of heat is evolved at once. This heat changes some of the water to steam explosively which can splash the acid on one’s face or clothes and cause acid burns.

Question 5 How is the concentration of hydronium ions (H 3 O + ) affected when a solution of an acid is diluted ? Answer: When a given amount of an acid is added to water, there is a fixed number of hydronium ions per volume of the solution. On dilution, the number of hydronium ions per volume decreases and concentration decreases.

Question 6 How is the concentration of hydroxide ions (OH – ) affected when excess base is dissolved in a solution of sodium hydroxide ? Answer: The concentration of hydroxide ions will increase when excess base is dissolved in a solution of sodium hydroxide, but it happens to a limited extent only after which the concentration becomes almost constant.

Page Number: 28

Question 1 You have two solutions A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic ? Answer: A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. Since solution A has more hydrogen ion concentration, solution A is acidic and solution B is basic.

Question 2 What effect does the concentration of H + (aq) ions have on the nature of the solution ? Answer: More the concentration of H + ions, higher the acidic nature of the solution.

Question 3 Do basic solutions also have H + (aq) ions ? If yes, then why are these basic ? Answer: Basic solutions have H + (aq) ions. But these are far less in number than OH – ions that is responsible for their basic nature.

Question 4 Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate) ? Answer: If the soil is too acidic (having low pH) then it is treated with materials like quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate).

Page Number: 33

Question 1 What is the common name of the compound CaOCl 2 ? Answer: Bleaching powder.

Question 2 Name the substance which on treatment with chlorine yields bleaching powder. Answer: Slaked lime Ca (OH) 2 .

Question 3 Name the sodium compound which is used for softening hard water. Answer: Sodium carbonate.

NCERT Solutions for Class 10 Science Chapter 2 Textbook Chapter End Questions

Question 1 A solution turns red litmus blue, its pH is likely to be (a) 1 (b) 4 (c) 5 (d) 10 Answer: (d) 10

Question 2 A solution reacts with crushed-egg shells to give a gas that turns lime water milky. The solution contains (a) NaCl (b) HCl (c) LiCl (d) KCl Answer: (b) HCl

Question 3 10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HC1. If we take 20 mL of the same solution of NaOH, the amount of HC1 solution (the same solution as before) required to neutralise it will be (a) 4 mL (b) 8 mL (c) 12 mL (d) 16 mL Answer: (d) 16 mL

Question 4 Which one of the following types of medicines is used for treating indigestion? (a) Antibiotic (b) Analgesic (c) Antacid (d) Antiseptic Answer: (c) Antacid

Question 5 Write word equations and then balanced equations for the reaction taking place when (a) dilute sulphuric acid reacts with zinc granules (b) dilute hydrochloric acid reacts with magnesium ribbon (c) dilute sulphuric acid reacts with aluminium powder (d) dilute hydrochloric acid reacts with iron filing Answer: (a) Zinc + dilute sulphuric acid → Zinc sulphate + Hydrogen Zn (s) + H 2 SO 4 (aq) → ZnSO 4 (aq) + H 2 (g)

(b) Magnesium ribbon + dil. Hydrochloric acid → Magnesium chloride + Hydrogen Mg (s) + 2 HCl (aq) → MgCl 2 (aq) + H 2 (g)

(c) Aluminium powder + dil. Sulphuric acid > Aluminium sulphate + Hydrogen 2Al (s) + 3H 2 SO 4 (aq) → Al 2 (SO 4 ) 3 (aq) + 3H 2 (g)

(d) Iron filings + Dilute hydrochloric acid > Ferric chloride + Hydrogen 2Fe (s) + 6HCl (aq) → 2FeCl 3 (aq) + 3H 2 (g)

Question 7 Why does distilled water not conduct electricity, whereas rainwater does ? Answer: Distilled water does not conduct electricity because it does not contain any ionic compound (like acids, bases or salts) dissolved in it. Rainwater, while falling to the earth through the atmosphere, dissolves an acidic gas carbon dioxide from the air and forms carbonic acid (H 2 CO 3 ). Carbonic acid provides hydrogen ions, H + (aq) and carbonate ions, CO(aq) 3 2 to rainwater. Hence, due to the presence of carbonic acid which provides ions to rainwater, the rainwater conducts electricity.

Question 8 Why do acids not show acidic behaviour in the absence of water ? Answer: The acidic behaviour of acids is due to the presence of hydrogen ions, [H + (aq) ions], in them. The acid produces hydrogen ions only in the presence of water. So in the absence of water, an acid will not form hydrogen ions and hence will not show its acidic behaviour.

Question 9 Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is (a) Neutral (b) Strongly alkaline (c) Strongly acidic (d) Weakly acidic (e) Weakly alkaline Arrange the pH in increasing order of hydrogen ion concentration. Answer: (a) D (b) C (c) B (d) A (e) E Increasing order of hydrogen ion concentration 11 < 9 < 7 < 4 < 1 i. e., C < E < D < A < B

Question 10 Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH 3 COOH) is added to test tube B. In which test tube will the fizzing occur more vigorously and why ? Answer: Fizzing will occur more vigorously in test tube A. Hydrochloric acid (HCl) is a strong acid whereas acetic acid (CH 3 COOH) is a weak acid. Being strong acid, the hydrochloric acid solution contains a much greater amount of hydrogen ions in it due to which the fizzing will occur more vigorously in test tube A (containing hydrochloric acid). The fizzing is due to the evolution of hydrogen gas which is formed by the action of acid on the magnesium metal of magnesium ribbon.

Question 11 fresh milk has a pH of 6. How do you think the pH will change as it turns into curd ? Explain your answer. Answer: pH of milk falls below 6 as it turns into curd due to the formation of lactic acid during this process. Lactic acid present in it reduces its pH value.

Question 12 A milkman adds a very small amount of baking soda to fresh milk. (a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline ? (b) Why does this milk take a long time to set as curd ? Answer: (a) Milk is made slightly alkaline so that it may not get sour easily due to the formation of lactic acid in it. (b) The alkaline milk takes a longer time to set into curd because the lactic acid being formed has to first neutralise the alkali present in it.

Question 13 Plaster of Paris should be stored in a moisture proof container. Explain why? Answer: Plaster of Paris should be stored in a moisture proof container because the presence of moisture can cause slow setting of plaster of Paris by bringing about its hydration. This will make the plaster of Paris useless after sometime.

Question 15 Give two important uses of washing soda and baking soda. Answer: Uses of washing soda : (i) Washing soda is used in glass, soap and paper industries. (ii) It is used for removing permanent hardness of water.

Uses of baking soda : (i) Baking soda is used as an antacid in medicines to remove acidity of the stomach. (ii) Baking soda is used for making baking powder (used in making cakes, bread, etc.).

NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases, and Salts

NCERT Solutions for Class 10 Science (Chemistry) Chapter 2 Acids, bases, and salts are part of NCERT Solutions for Class 10 Science. Here we have given Class 10 Science NCERT Solutions Chapter 2.

Question 1 You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution respectively. If you are given only red litmus paper, how will you identify the contents of each test tube? Solution: The contents of each test tube would be identified by change in colour of red litmus paper. For example, when we wet the red litmus paper with the basic solution, it changes into blue colour. Put the changed blue litmus paper in the solution which turns the blue to red will be the acidic solution. The solution, which has no effect on any litmus paper, will be neutral and hence it will be distilled water.

Download NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts PDF

Question 2 Why should curd and sour substances not be kept in brass and copper vessels? Solution: Curd and other sour foodstuffs contain acids, which can react with the metal of the vessel to form poisonous metal compounds which can cause food poisoning and damage our health.

Question 4 Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride. Solution: The gas that extinguishes a burning candle is carbon dioxide, which is formed by the action of dilute hydrochloric acid on a metal carbonate and produces effervescence. Now, since one of the compounds formed is calcium chloride, it shows that the metal compound is calcium carbonate. Thus, the metal compound A is calcium carbonate (CaCO 3 ). Calcium carbonate reacts with dilute hydrochloric acid to form calcium chloride, carbon dioxide and water. This can be written as:

Question 5 Why do HCl, HNO 3 , etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character? Solution: An acid is a substance, which dissociates on dissolving in water to produce hydrogen ions [H + (aq) ions]. The acids like HCl, H 2 SO 4 , HNO 3 and CH 3 COOH, etc., show acidic character because they dissociate in aqueous solutions to produce hydrogen ions, H+(aq) ions. The compounds such as glucose and alcohol also contain hydrogen but they do not show acidic character. The aqueous solutions of glucose and alcohol do not show acidic character because the hydrogen in them does not separate out as hydrogen ions [H + (aq) ions] on dissolving in water.

Question 6 Why does an aqueous solution of acid conduct electricity? Solution: The aqueous solution of an acid conducts electricity due to the presence of charged particles called ions in it.

Question 7 Why does dry HCl gas not change the colour of the dry litmus paper? Solution: Dry HCl gas does not contain any hydrogen ions in it, so it does not show acidic behaviour. In fact, dry HCl gas does not change the colour of dry litmus paper as it has no hydrogen ions [H + (aq) ions] in it.

Question 8 While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? Solution: Diluting an acid should be done by adding concentrated acid to water gradually with stirring and not by adding water to concentrated acid. The heat is evolved gradually when a concentrated acid is added to water for diluting an acid and the large amount of water is easily absorbed. If, however, water is added to concentrated acid to dilute it, a large amount of heat is evolved at once. The heat generated may cause the mixture to splash the acid on our face or clothes and cause acid burns.

Question 9 How is the concentration of hydronium ions (H 3 O+) affected when a solution of an acid is diluted? Solution: When the concentrated solution of an acid is diluted by mixing water, the concentration of hydronium ions H 3 O+ per unit volume decreases.

Question 10 How is the concentration of hydroxide ions (OH-) affected when excess base is dissolved in water? Solution: When the solution of a base is diluted by mixing more water in it, the concentration of hydroxide ions (OH – ions) per unit volume decreases.

Question 11 You have two solutions A and B. The pH of solution A is 6 and pH of solution B is 8. i. Which solution has more hydrogen ion concentration? ii. Which of this is acidic and which one is basic? Solution: The pH of a solution is inversely proportional to its hydrogen ion concentration. This means that the solution having lower pH will have more hydrogen ion concentration. In this case, solution A(having a lower pH of 6) will have more hydrogen ion concentration.Solution A is acidic and solution B is basic.

Question 12 What effect does the concentration of H + (aq) ions have on the nature of the solution? Solution: Acids produce hydrogen ions in water. So, when an acid is added to water, the concentration of hydrogen ions in water increases. The solution of acid thus formed will have more of hydrogen ions and it will be acidic in nature.

Question 13 Do basic solutions also have H + (aq) ions? If yes, why are these basic? Solution: No, the basic solution doesn’t have H + ions as the solution has excess of hydroxide ions.

Question 14 Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)? Solution: Most often the soil in the fields is too acidic. If the soil is too acidic (having low pH), it is treated with materials like quicklime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate). Thus, a farmer should add lime or slaked lime in his fields when the soil is too acidic.

Question 15 What is the common name of the compound CaOCl 2 ? Solution: The common name of the compound CaOCl 2 is bleaching powder.

Question 16 Name the substance that on treatment with chlorine yields bleaching powder. Solution: Calcium hydroxide is the substance that on treatment with chlorine yields bleaching powder.

Question 17 Name the sodium compound, which is used, for softening hard water. Solution: Sodium carbonate (washing soda) is used for softening hard water.

Question 19 Write an equation to show the reaction between plaster of Paris and water. Solution: Plaster of Paris has a very remarkable property of setting into a hard mass on wetting with water. So, when water is added to plaster of Paris, it sets into a hard mass in about half an hour. The setting of plaster of Paris is due to the hydration crystals of gypsum, which set to form a hard, solid mass.

Question 20 Why does distilled water not conduct electricity, whereas rainwater does? Solution: Distilled water does not conduct electricity because it does not contain any ionic compound (like acids, bases or salts) dissolved in it. On the other hand, rain water conducts electricity. This can be explained as follows: Rain water, while falling to the earth through the atmosphere, dissolves an acidic gas carbon dioxide from the air and forms carbonic acid (H 2 CO 3 ). Carbonic acid provides hydrogen ions, H + (aq), and carbonate ions, CO 2- 3 (aq), to rain water. So, due to the presence of carbonic acid (which provides ions to rain water), the rain water conducts electricity.

Question 21 Why do acids not show acidic behaviour in the absence of water? Solution: The acidic behaviour of acid is due to the presence of hydrogen ions. The acids will not show its acidic behaviour in the absence of water, this is because the acids produce hydrogen ions only in the presence of water.

Question 23 Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test-tube A while acetic acid (CH 3 COOH) is added to test-tube B. In which test-tube will fizzing occur more vigorously and why? Solution: Acetic acid (CH 3 COOH) is a weak acid whereas hydrochloric acid (HCl) is a strong acid. Fizzing occurs in the test tube due to the evolution of hydrogen gas by the action of acid on magnesium ribbon. Since hydrochloric acid is a strong acid a large amount of hydrogen gas is liberated in the test tube A. So fizzing occurs more vigorously in test tube A . Question 24 Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain. Solution: The pH will change to below 6, as lactic acid is formed when milk turns into curd.

Question 27 Give two important uses of washing soda and baking soda. Solution: Washing soda 1. It is often used as an electrolyte. 2. Domestically it is used as a water softener during laundry. Baking soda 1. It is used to test garden soil for acidity. If it develops bubbles, the soil is too acidic. 2. Washing a car with it can remove dead bug bodies without damaging the paint.

NCERT Solutions for Class 10 Science Chapter 2 (MCQs) [1 Mark each]

Question 2. Which of the following statements shows the property of an acid? [CCE 2014] (a) It turns blue litmus to red (b) It is sour in taste (c) It has no effect on red litmus (d) All of the above Answer: (d) An acid turns blue litmus red. Thus, it has no effect on red litmus and acids are sour in taste.

Question 3. A drop of a liquid sample was put on the pH paper. It was observed that the colour of the pH paper turned blue. The liquid sample is [CCE 2014] (a) lemon juice (b) sodium bicarbonate solution (c) distilled water (d) hydrochloric acid Answer: (b) The liquid sample is of sodium bicarbonate (NaHC 3 ) solution. It is a basic solution. And we know that a basic solution turns pH paper blue.

Question 4. Two solutions X and Y were found to have pH value of 4 and 10 respectively. The inference that can be drawn is [CCE 2014] (a) X is a base and Y is an acid (b) Both X and Y are acidic solutions (c) X is an acid and Yis a base (d) Both X and Y are bases Answer: (c) Any solution having pH > 7 will be a base while the solution having pH < 7 will surely be an acid. Hence, it can be concluded that X is an acid (pH=4, i.e. < 7) and Yis a base (pH =10, i.e. > 7).

Question 5. A student was asked to collect apparatus from lab store, for doing experiment of pH of given sample. Identify the article which he is not supposed to pick. [CCE 2014] (a) pH paper (b) Dropper (c) Litmus paper (d) Petri dish Answer: (d) Petri dish is not required for doing experiment of pH.

Question 7. A solution has pH value of 5. On adding 10 mL of NaCl to it, what will be the pH of the new solution? (a) More than 5 (b) Less than 5 (c) Only seven (d) No change in pH Answer: (d) As NaCl is a neutral solution due to its complete ionization in H 2 O and has pH = 7. Thus, it will not affect the pH of the solution. Hence, the pH of the solution will remain unaffected.

Question 8. A salt is dissolved in water. The pH of this salt solution was found to be 7 by measuring the pH with a universal indicator paper. The salt is most likely to be (a) Na 2 CO 3 (b) KCl (c) NH 4 Cl (d) CH 3 COONa Answer: (b) Salts which are completely ionisable in water are said to be neutral salts and their pH is equal to 7. Among the given salts, only KCl is completely ionisable in the following manner: KCl (aq) → K + + Cl Hence, the pH of KCl will be 7.

Question 11. Four students I, II, III and IV were asked to examine the changes for blue and red litmus paper strips with dil. HCl (Solution A) and dil. NaOH (Solutions). The following observations were reported by the 4 students. The sign …………. indicates no colour change. [CCE 2015 ]

The correct observation would be of student (a) I (b) II (c) III (d) IV Answer: (c) The correct observation is taken by student III because HCl (solution A) is an acid which turns blue litmus red and dil. NaOH (solution B) is a base which turns red litmus blue.

Question 12. A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish orange. Which of the following would change the colour of this pH paper to greenish blue? [NCERT Exemplar] (a) Lemon juice (b) Vinegar (c) Common salt (d) An antacid Answer: (d) As pH paper turns greenish blue for weakly basic compound and antacids contain weak base like Mg(OH) 2 . So, an antacid would change the colour of this pH paper to greenish blue. Other options (a) and (b) contain acids and option (c) is a neutral salt.

NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts (Hindi Medium)

Class 10 Science Acid, Bases and Salts Mind Map

• Produce [H+] in H 2 O
• Turns blue litmus red
• Acts as electrolyte in solution

Chemical Properties Of Acids Acids + Metal → Salt + H 2 e.g. H 2 SO 4  + Zn → ZnSO 4  + H 2 Acids + Metal Carbonate/Metal hydrogen Carbonate = Salt + CO 2 e.g NaHCO 3  + HCl → NaCl + H 2 O + CO 2 Acids + Bases → Salt + water NaOH + HCl → NaCl + H 2 O Acids + Metal oxide → Salt + Water H 2 SO 4  + CuO → CuSO 4  + H 2 O

• Produce [OH ] in H 2 O
• Bitter taste
• Turns red litmus blue
• Water soluble bases are known as alkali

Chemical Properties Of Bases

Bases + Metals → Salt + H 2 2NaOH + Zn → Na 2 ZnO 2 + H 2 Bases + Acids → Salt + Water KOH + HCl → KCl + H 2 0 Base + Non-metallic oxide → Salt + water 2NaOH + CO 2 → Na 2 CO 3 + H 2 O

Salt is formed by combination of acid and base through neutralization reaction. water of Crystallization : It is the fixed number of water molecules present in one formula unit of a salt e.g. CuSO 4 .5H 2 O, Na 2 CO 3 .10H 2 O

Types of Salts

The acidic &amp; basic nature of salts depends on the acid and base combined in neutralization reaction.

Some Important Salts

Bleaching Powder (CaOCl 2 ): Ca(OH) 2  + Cl 2  → CaOCl 2  + H 2 O dry slaked lime

• as an oxidising agent in chemical industry.
• In disinfecting water.

Common Salt NaCl:

• Main source is sea water.
• Also exists in the form of rock hence also known as rock salt.
• Important component of food.
• Used in preparation of sodium hydroxide, baking soda & washing soda.

Baking Soda (NaHCO 3 )

• NaCl + H 2 O + CO 2  + NH 23  → NH 4 Cl + NaHCO 3
• Mild non – corrosive

• Used as in baking cakes as antacid
• Fire extinguisher

Washing Soda (Na 2 CO 3 . 10H 2 O) : • Na 2 CO 3  + 10H 2 O → 4 Na 2 CO 3 . 10H 2 O • Used in glass, soap & paper indusby, removing Permanent hardness of water and cleaning agent

These are the substances which indicate the acidic or basic nature of the solution by their colour change.

Strength of Acids and Bases in Solution

• Some animals like bee and plants like nettle secretes highly acidic substance for self defense.
• Lower pH of sour & sweet food can cause tooth decay. The pH of mouth should be more than 5.5
• The inner lining of stomach protects vital cells from the acidic pH which is developed by HCl secreted by stomach. The optimum pH range for human body is 7 to 7.8

Addition of Acids or Bases to Water

Always add acid to water and not water to acid because this process is highly exothermic. The acid must be added slowly to water by constant shirring on. Adding water to a concentrated acid, the heat generated may cause the mixture to splash out and cause burns.

Now that you are provided all the necessary information regarding NCERT Solutions for Class 10 Science Chapter 2 Activities and we hope this detailed article on NCERT Solutions For Class 10 Science Chapter 2 Acids And Bases is helpful. If you have any query regarding this article or Science Class 10 Chapter 2 Acids And Bases, drop your comments in the comment box below and we will get back to you as soon as possible.

NCERT Solutions for Class 10 Science All Chapters

• Chapter 1 Chemical Reactions and Equations
• Chapter 2 Acids, Bases and Salts
• Chapter 3 Metals and Non-metals
• Chapter 4 Carbon and Its Compounds
• Chapter 5 Periodic Classification of Elements
• Chapter 6 Life Processes
• Chapter 7 Control and Coordination
• Chapter 8 How do Organisms Reproduce?
• Chapter 9 Heredity and Evolution
• Chapter 10 Light Reflection and Refraction
• Chapter 11 Human Eye and Colourful World
• Chapter 12 Electricity
• Chapter 13 Magnetic Effects of Electric Current
• Chapter 14 Sources of Energy
• Chapter 15 Our Environment
• Chapter 16 Management of Natural Resources

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NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts

Class 10 Science Chapter 2 Solutions Class 10 Science Chapter 2 Exercises Solutions Class 10 Science Chapter 2 Intext Exercises Class 10 Science Chapter 2 in Hindi Medium Class 10 Science Book Download in PDF Class 10 Science Chapter 2 Notes Class 10 Science Chapter 2 Board Questions Class 10 Science Chapter 2 MCQ Class 10 Science Chapter 2 Extra Questions Class 10 Science NCERT Solutions Class 10 all Subjects Solutions

NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts in Hindi and English Medium updated for CBSE session 2024-25. In NCERT Class 10 Science, Chapter 2 Acids, Bases, and Salts, chapter covers various topics related to acids, bases, and salts, which are fundamental concepts in chemistry. Here is an outline of the chapter 2 covered in NCERT Class 10 Science Chapter 2. Definition and basic properties of acids and bases. Get here the revised solutions of chapter 2 class 10th science based on new syllabus and textbooks issued for academic year 2024-25.

Class 10 Science Chapter 2 Answers in Hindi and English Medium

• Class 10 Science Chapter 2 Exercises
• Class 10 Science Chapter 2 Intext Questions
• Class 10 Science Chapter 2 in Hindi
• Class 10 Science Chapter 2 in PDF
• Class 10 Science Chapter 2 Notes
• Class 10 Science Chapter 2 Board Questions
• Class 10 Science Chapter 2 MCQ
• Class 10 Science Chapter 2 Extra Questions
• Class 10 Science NCERT Solutions
• Class 10 all Subjects Solutions

Chemical Properties of Acids and Bases Explanation of various chemical properties of acids (e.g., corrosiveness, reaction with metals, and litmus paper test). Chemical properties of bases (e.g., reaction with metals, reaction with acids, and litmus paper test). Use of indicators to test for acidity and basicity (e.g., litmus paper, pH paper, and universal indicator). Importance of pH scale in measuring acidity and basicity.

Strength of Acids, Bases and Salt Differentiating between strong and weak acids and bases. Explanation of concentration and ionization in the context of strong and weak acids/bases. The importance of common salt (sodium chloride, NaCl) in daily life. Production of various chemicals from common salt (e.g., sodium hydroxide, chlorine, and baking soda).

Uses of Acids and Bases and Preparation of Salts Various industrial and domestic applications of acids and bases. The role of acids and bases in food preservation and digestion. Methods for preparing salts, including Neutralization reactions (e.g., acid + base → salt + water). Solubility rules for predicting the formation of precipitates. Understanding the pH scale in detail. pH values of common substances and their Classification as acidic, neutral, or basic. It’s important to refer to the NCERT textbook you are using for any updates or additional details related to the chapter.

Importance of pH and Neutralization How pH plays a crucial role in various processes and products, such as agriculture, health, and industry. Concept of neutralization reactions. Balanced chemical equations for neutralization reactions. Learn here how the concentration of hydrogen ions (H⁺) is related to the pH of a solution. Importance of Self-Defense in Animals and Plants that How some animals and plants use acids and bases for self-defense. These are the main topics typically covered in NCERT Class 10 Science Chapter 2 Acids, Bases, and Salts.

Preparing for NCERT Class 10 Science Chapter 2 , Acids, Bases, and Salts, or any chapter in a more effective manner involves a structured and thorough approach. Here are some steps and tips to help students prepare for this chapter: Start by reading the chapter from your NCERT textbook to grasp the fundamental concepts. Pay attention to definitions, properties, and examples of acids, bases, and salts.

Just like English Medium, Hindi Medium solutions of chapter 2 intext questions Page 20 ke Uttar or Page 24 ke Uttar or Page 27 ke Uttar or Page 31 ke Uttar or Page 36 ke Uttar or Abhyas ke Prashn Uttar are given to use free updated for new academic session 2024-25. Download CBSE Solutions Apps in Hindi & English Medium. These NCERT Solutions are based on latest CBSE Curriculum. 10th Science chapter 2 intext questions answers given on Page 18, Page 22, Page 25, Page 28, Page 33 and chapter end Exercises in English Medium and Hindi Medium free to use. Get here Important Questions which are important for Board Exams, Revision Notes and MCQ of Chapter 2 in 10th Science .

Take Notes and Use Visual Aids While reading, take concise notes summarizing key points, definitions, and equations. Organize your notes for easy reference. Utilize diagrams and charts provided in the textbook to understand the concepts visually. You can also create your own diagrams or flowcharts to visualize complex processes. Solve the exercises and practice problems provided at the end of the chapter.

Focus on Chemical Equations and Use Online Resources Pay special attention to chemical reactions involving acids, bases, and salts. Practice balancing chemical equations related to neutralization reactions and salt formation. Explore online resources, such as video tutorials and interactive simulations, to reinforce your understanding of acid-base concepts. Allocate regular study time for this chapter to ensure you cover all the topics in a structured manner. Consistency is key to effective learning.

Class 10 Science Chapter 2 Practice Tests with Answers

• Class 10 Science Chapter 2 Test 1
• Class 10 Science Chapter 2 Test 2
• Class 10 Science Chapter 2 Test 3
• Class 10 Science Chapter 2 Test 4
• Class 10 Science Chapter 2 Test 5

Understand pH Scale and Use Mnemonics Thoroughly understand the pH scale and its significance in measuring acidity and basicity. Practice calculating pH values. Perform Experiments: If possible, conduct simple experiments related to acids, bases, and salts to observe reactions firsthand. This practical experience can enhance your understanding. Create mnemonics or memory aids to remember key concepts, formulas, and terms. Mnemonics can be a fun and effective way to recall information during exams.

Discuss with Peers and Practice Previous Year Papers Discussing concepts with classmates or forming study groups can help you clarify doubts and reinforce your knowledge through discussions. Don’t hesitate to ask your teacher for clarification if you have doubts or questions about any topic within the chapter. Solving previous year’s question papers can give you an idea of the types of questions that might be asked in the exam and help you improve your time management.

Focus on Self-Assessment and Revision Periodically assess your understanding of the chapter by taking self-assessment quizzes or mock tests. Identify areas where you need further practice. As your exams approach, revise the chapter thoroughly. Focus on your notes, important formulas, and frequently asked questions. By following a structured study plan and using a variety of learning resources, you can prepare for NCERT Class 10 Science Chapter 2 in a better way and perform well in your exams.

Tiwari Academy is an educational platform that provides resources and support for students preparing for various academic exams, including NCERT Class 10 Science Chapter 2, which covers the topic of CBSE Syllabus. Tiwari Academy offers detailed and well-explained NCERT solutions for Class 10 Science Chapter 2. These solutions can help students understand the concepts, solve problems, and prepare for exams effectively.

Tiwari Academy provides video lectures or tutorials covering the topics in Chapter 2. Video lectures can be a helpful visual aid for students to grasp complex concepts and understand practical experiments and demonstrations related to acids, bases, and salts. We often offers a wide range of practice questions and exercises related to Class 10 Science Chapter 2 . These questions can help students test their knowledge and improve their problem-solving skills in the context of acids, bases, and salts.

Sample Papers and Previous Year Question Papers We provide sample papers and previous year’s question papers for Class 10 Science. Practicing these papers can help students get a feel for the exam pattern and become familiar with the types of questions asked in the board exams. We provide concise and well-organized notes and study material related to Chapter 2. Being an educational platform, we offer online tests and quizzes to assess students’ knowledge and track their progress. These tests can help students identify their strengths and weaknesses in the chapter.

Tiwari Academy have a mechanism for students to ask questions and clarify doubts related to Chapter 2. This can be especially helpful for students who are struggling with certain concepts or problems. We offer interactive learning features such as forums, Discussion Forum, chat support where students can interact with teachers and peers, fostering a collaborative learning environment.

From an examination point of view, NCERT Class 10 Science Chapter 2 , Acids, Bases, and Salts, holds significant importance. Here’s why this chapter is important for students preparing for Class 10 Science examinations. Questions related to acids, bases, and salts often carry a significant weightage in the Class 10 Science board examinations. This means that a substantial portion of the exam paper is dedicated to this chapter.

Class 10 Science chapter 2 introduces students to fundamental concepts in chemistry, such as the properties of acids and bases, the pH scale, and chemical reactions involving acids and bases. Mastery of these concepts is crucial for building a strong foundation in chemistry. The knowledge gained from this chapter is not just theoretical; it has practical applications in daily life. Questions related to the uses of acids, bases, and salts in various industries and processes are common in board exams.

NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts Intext questions and chapter end exercises question answers are given below updated for new academic session 2024-25. NCERT Solutions are given in English and Hindi Medium free to use. Offline Apps 2024-25 are also in updated format free to download. Download Class 10 all Subjects App for mobile use.

Class 10 Science Chapter 2 Extra Question Answers

Define indicators. name two natural indicators obtained from plants..

Indicators are substances which give different colour in acid or bases solutions. Natural indicators from plants are: (a) Litmus, (b) Vanilla extract.

What are antacids?

Antacids are mild alkalies. These are used for getting relief from acidity and indigestion and sometimes, even headache. When taken orally, it reacts with hydrochloric acid present in the stomach and reduces its strength by consuming some of it. For example, milk of magnesia is an antacid.

What are olfactory indicators? Give an example.

Olfactory indicators are substances which have different odour in acid and base solutions. For example, vanilla essence has characteristics pleasant smell in acid solution and no smell in alkali solution.

Tap water conducts electricity whereas distilled water does not. Why?

Tap water contains some impurities in the forms of salts. Due to presence of salts, it conducts electricity. Distilled water is free from all kinds of salts and hence does not conduct electricity.

While diluting an acid, why is it recommended that the acid should be added to water and not water into the acid?

When an acid is mixed with water, there is evolution of large amount of heat. Therefore, acid is slowly added to water. If on the other hand, water is added to acid, it might spill on your body and clothes due to explosion and evolution of sudden and large amount of heat.

What is meant by the term pH of a solution? The pH of rain water collected from two cities A and B was found to be 6 and 5 respectively. The water of which city is more acidic?

pH is a term which indicates whether a solution is acidic of basic and to what extent. Mathematically it is a measure of H+ ions concentration in water. The rain water collected from city B is more acidic.

Tooth enamel is one of the hardest substance in our body. How does it undergo damage due to eating chocolates and sweets? What should we do to prevent it?

Sugar present in chocolates and sweets gets broken to acids by bacteria present in the mouth. This lowers the pH in the mouth. Tooth enamel is made up of calcium phosphate, which gets corroded when the pH in the mouth is below 5.5. To prevent tooth enamel from decay, toothpaste is used because it is alkaline and neutralises the acid produced in the mouth and helps to prevent lowering of pH in mouth.

Why are commercial samples of bleaching powder not completely soluble in water?

Bleaching powder is soluble in water. However, commercial samples of bleaching powder contains slaked lime that does not react with chlorine gas during the manufacture of bleaching powder. The insoluble part of bleaching powder is this white solid, i.e., slaked lime.

We provide additional resources such as animations, diagrams, and illustrations to enhance the understanding of complex topics in 10th Science Chapter 2 , particularly those related to chemical reactions and pH. Tiwari Academy offers tips and strategies for effective time management during exam preparation, helping students balance their study schedule with other activities. It’s important for students to explore these resources and choose the ones that align with their learning style and needs. Additionally, students should complement these online resources with their school textbooks and regular study routines to achieve the best results in their Class 10 Science board exams.

Problem Solving and Balanced Chemical Equations Students are often required to solve numerical problems related to acid-base reactions, pH calculations, and concentration in the exam. These problems assess their problem-solving skills and application of concepts. Understanding and balancing chemical equations for reactions involving acids, bases, and salts is a key part of this chapter. Questions related to chemical equations are commonly asked.

Question 1 : What is a neutralization reaction? Give some examples. Answer 1 : When the effect of a base is nullified by an acid and vice versa, it is called neutralization reaction. In general, a neutralization reaction is written as: Base + Acid ―> Salt + Water Examples: (a) Aqueous solution of base, NaOH is neutralized by aqueous hydrochloric acid.

(b) Aqueous solution of sulphuric acid is neutralized by aqueous solution of sodium hydroxide.

Some board exams may include questions about experiments related to acids and bases. Students may be asked to describe experimental setups, observations, and inferences. Questions related to pH calculations and the interpretation of pH values are a recurring theme in the exams. Students should be able to determine whether a solution is acidic, neutral, or basic based on its pH. This chapter encourages students to develop practical skills by conducting experiments related to acid-base reactions. Practical skills are often tested in the board exams.

Board exams may include application-based questions that require students to apply their knowledge of acids, bases, and salts to solve real-life problems or scenarios. Understanding the chemical reactions involved in neutralization and salt formation is important for answering questions about the preparation and properties of salts. Beyond rote memorization, this chapter emphasizes conceptual understanding. Students should be able to explain the properties and behavior of acids, bases, and salts.

Question 2 : An alkali is an important base used for the laboratory work. Name the base and state how it can be prepared from common salt? What is this process called? Answer 2 : An important alkali commonly needed for laboratory work is sodium hydroxide. It can be prepared from sodium chloride by the process of electrolysis. This is called chlor-alkali process. Electrolysis of aqueous solution of sodium chloride: When electricity is passed through an aqueous solution of sodium chloride commonly called brine, it decomposes into chloride and sodium. Sodium is collected at the cathode where it reacts with water to form sodium hydroxide. Chlorine is formed at the anode and is collected as a gas.

The overall reaction is

Question 1 : (a) How does baking soda helps to make cakes and bread soft and spongy? OR Give reason: cake rise on adding baking powder . (b) Write chemical equation for its preparation. Answer 1 : (a) On heating , sodium bicarbonate decomposes to produce carbon dioxide. This causes biscuits and cakes etc. to expand and become light. The other constituents act as preservatives. (b)

Question 2 : Why does bleaching powder smell strongly of chlorine? Answer 2 : Bleaching powder smells strongly of chlorine because it slowly reacts with carbon dioxide of air to evolve chlorine gas.

Important Questions on 10th Science Chapter 2

What is a neutralization reaction give some examples..

When the effect of a base is nullified by an acid and vice versa, it is called neutralization reaction. In general, a neutralization reaction is written as: Base + Acid ―> Salt + Water

Why does distilled water not conduct electricity, whereas rain water does?

Distilled water is a pure form of water not containing any ionic species. Therefore, it does not conduct electricity. Rain water, being an impure form of water, contains many ionic species (dissolved in air) such as acids and therefore it conducts electricity.

Why do acids not show acidic behaviour in the absence of water?

Acids do not show acidic behaviour in the absence of water because the dissociation of hydrogen ions (H+ ) from an acid occurs in the presence of water only. It is the hydrogen ions (H+ ) that are responsible for the acidic behaviour.

Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer.

The pH of milk is 6. As it changes to curd, the pH will reduce because curd is acidic in nature. The acids present in it decrease the pH.

Why does an aqueous solution of an acid conduct electricity?

Acids dissociate in aqueous solutions to form ions. These ions are responsible for conduction of electricity.

Why does dry HCl gas not change the colour of the dry litmus paper?

Colour of the litmus paper is changed by the hydrogen ions. Dry HCl gas does not contain H+ ions. It is only in the aqueous solution that an acid dissociates to give ions. Since in this case, neither HCl is in the aqueous form nor the litmus paper is wet, therefore, the colour of the litmus paper does not change.

In summary, NCERT Class 10 Science Chapter 2 , Acids, Bases, and Salts, is important for board exams because it covers foundational concepts in chemistry and offers practical applications. Students should focus on understanding the principles, mastering problem-solving skills, and being able to apply their knowledge to various scenarios to excel in the examination.

Is chapter 2 of grade 10th Science important from the exam point of view?

Yes, chapter 2 (Acids, Bases, and Salts) of grade 10th Science is important from the exam point of view. Every year questions come from chapter 2 in the exams. There are 34 questions in chapter 2. All the questions of this chapter are significant and can come in the exams. But the most important questions of this chapter that have more chance to come in the board exam are question 3 (page number 22), questions 1, 4 (page number 25), question 1 (page number 28), questions 3, 4 (page number 33), and from back exercise questions 2, 3, 5, 8, 10, 12, 15 are important.

What are the main topics to cover in chapter 2 of class 10th Science NCERT?

After completing chapter 2 of class 10th Science, students will gain the knowledge of the following topics:

• 1. Understanding the chemical properties of acids and bases a. Acids and Bases in the Laboratory b. How do Acids and Bases React with Metals? c. How do Metal Carbonates and Metal Hydrogencarbonates React with Acids? d. How do Acids and Bases React with each other? e. Reaction of Metallic Oxides with Acids f. The reaction of a Non-metallic Oxide with Base
• 2. What do all acids and all bases have in common? a. What Happens to an Acid or a Base in a Water Solution?
• 3. How strong are acid or base solutions? a. Importance of pH in Everyday Life
• 4. More about salts a. Family of Salts b. pH of Salts c. Chemicals from Common Salt d. Are the Crystals of Salts really Dry?

What are the common acids in Chapter 2 of NCERT Class 10 Science that we use in our daily life?

Some acids that we use in our daily life are: 1. Vinegar 2. Orange 3. Tamarind 4. Tomato 5. Curd 6. Lemon 7. Plums 8. Pineapples 9. Coca-cola 10. Apple juice

Is there any activity for CBSE Board Exam in chapter 2 of 10th Science?

There are 15 activities in chapter 2 (Acids, Bases, and Salts) of grade 10th Science. All the activities are nice, interesting, and logical. These activities help students to understand the chapter easily and practically. Students enjoy doing these activities in school.

What is the concept of acid rain in chapter 2 of grade 10th Science textbook?

When the pH of rainwater is less than 5.6, it is known as acid rain. Acid rains are dangerous. The survival of aquatic life becomes difficult.

Is chapter 2 Acids, Bases and Salts of grade 10th Science easy to learn?

Chapter 2 Acids, Bases and Salts of grade 10th Science is not at all challenging. This chapter is overall a simple chapter. However, the difficulty level of any chapter 2 depends on students also. Some students find chapter 2 easy, and some students find chapter 2 difficult.

« Chapter 1: Chemical Reactions and Equations

Chapter 3: metals and non-metals ».

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Providing help in science for class 6 to 10. Adviser in Tiwari Academy for the science related subjects subject as well as videos contents. Ample teaching experience in schools. I am not only working for Tiwari Academy but also provide new ideas for the website and apps.

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Case Study Question for Class 10 Science (CBSE Board)

Case Study Question Class 10 Science for CBSE Board: Understudies can discover the chapter astute vital questions for course 10th Science within the table underneath. These imperative questions incorporate questions that are regularly inquired in a long time. Moreover, arrangements are to give for these questions, with extraordinary accentuation on ease-of-study. Tap on the joins underneath to begin investigating.

Case Study Question for Class 10 Science Ch. 1 to 16

Case study: 1.

Ans. Traits like ‘T’ are called dominant traits, while those that behave like ‘t’ are called recessive traits./Alternatively accept the definition of dominant and recessive traits with examples of T and t respectively /Alternatively accept the law of Dominance with examples of T and t.

When F1 plants were cross – pollinated with plants having tt genes, a total of 800 plants were produced. How many of these would be tall, medium height or short plants? Give the genotype of F 2 generation.

Case Study: 2 Question Class 10 Science

2) Ansari Sir was demonstrating an experiment in his class with the setup as shown in the figure below. (CBSE Sample Paper 2022)

c.) Consider the situation where the Magnet goes in and out of the coil. State two changes which could be made to increase the deflection in the galvanometer.

This is due to changing magnetic field /flux associated with the coil as the magnet moves in and out.

Case Based Questions Class 10 Science Chapter-wise:

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NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases And Salts

The Class 10 NCERT Solutions for Science Chapter 2 Acids, Bases And Salts includes all the intext and exercise questions. Class 10 Science Chapter 2 Acids, Bases And Salts NCERT questions and answers help students to clear their doubts and to obtain good marks in Class 10 board exam. All the solutions provided in this article are strictly based on the CBSE syllabus and curriculum.

Class 10 Science Chapter 2 NCERT Questions and Answers

Class 10 Science Chapter 2 Acids, Bases And Salts NCERT Questions and Answers are prepared by experts with a detailed explanation that will help students complete their assignments & homework. Having a good grasp over CBSE NCERT Solutions for Class 10 Science will further help the students in their preparation for board exams and other competitive exams such as NTSE, Olympiad, etc.

NCERT Solutions for Class 10 Science Chapter 2 Intext Questions

Intext Questions (Page No. 18)

Question 1: You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?

Answer: We can identify the content in each of the test tubes using red litmus paper. This can be done by noticing the colour change of the red litmus paper.

• If the red litmus paper changes to blue colour the solution is a basic solution.
• If the red litmus paper experiences no change in acidic solution.
• If the red litmus paper changes to purple colour the solution is distilled water.

Intext Questions (Page No. 22)

Question 1: Why should curd and sour substances not be kept in brass and copper vessels?

Answer: Curd and sour substances contain acids. These acids can react with brass and copper vessels to form toxic compounds. This makes the substances unfit for human consumption. Hence, they are not kept in brass and copper vessels.

Question 2: Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Answer: Hydrogen gas is usually liberated when an acid reacts with a metal.

 Zn(s) + 2HCl(aq) → ZnCl 2 (aq) + H 2 (g)

The equation given above illustrates how zinc reacts with dilute hydrochloric acid resulting in the liberation of hydrogen gas and the formation of the salt zinc chloride.

A burning match stick, when brought near the mouth of the test tube where H 2 gas is being released makes a pop sound. This confirms the presence of hydrogen gas.

Question 3: Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

Answer: Metal compound A is Calcium carbonate (CaCO 3 ). When A reacts with dilute hydrochloric acid it produces effervescence. The chemical equation is given as:

CaCO 3 (s) + 2HCl(aq) → CaCl 2 (aq) + CO 2 (g) + H 2 O (l)

The gas evolved is CO 2 . CO 2 extinguishes a burning candle.

Intext Questions (Page No. 25)

Question 1: Why do HCl, HNO 3 , etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?

Answer: When HCl or HNO 3 are mixed with water, they dissolve in water to form hydrogen ions (H + ) or Hydronium ions (H 3 O + ) which show their acidic character.

Although aqueous solutions of glucose and alcohol contain hydrogen, these cannot dissociate in water to form hydrogen ions. Hence, they do not show acidic character.

Question 2: Why does an aqueous solution of acid conduct electricity?

Answer: An acid dissolves in water and dissociates to form H + or H 3 O + ions. Electricity is conducted through these moving ions.

Question 3: Why does dry HCl gas not change the colour of the dry litmus paper?

Answer: Colour of the litmus paper is changed by the hydrogen ions. Dry HCl gas does not contain H + ions. It is only in the aqueous solution that an acid dissociates to give ions. Since in this case, neither HCl is in the aqueous form nor the litmus paper is wet, therefore, the colour of the litmus paper does not change.

Question 4: While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?

Answer: While diluting an acid, it is recommended that the acid should be added to water and not water to the acid because if water is added to concentrated acid, it release huge amount of heat which may result in explosion and can cause acid burns o face, clothes and body parts. Hence it is safe to add acid to water but not water to acid.

  Question 5: How is the concentration of hydronium ions H 3 O + affected when a solution of an acid is diluted?

Answer: When the solution of acid is diluted then the concentration of hydronium ion H 3 O + per unit volume decreases. On adding water, the H + ions of the acid and hydroxyl ions of water react to form water molecules and the concentration of hydronium ions decreases. 

Question 6: How is the concentration of hydroxide ions OH — affected when excess base is dissolved in a solution of sodium hydroxide?

Answer: When the base is mixed with sodium hydroxide solution there is an increase in the number of hydroxide ions whereas the volume remains almost the same. This leads to an increase in the concentration of OH — ions per unit volume.

Intext Questions (Page No. 33)

Question 1: You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?

Answer: A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. Therefore, the solution with pH = 6 is acidic and has more hydrogen ion concentration than the solution of pH = 8 which is basic.

Question 2 : What effect does the concentration of H + (aq)ions have on the nature of the solution?

Answer: Concentration of H + (aq) can have a varied effect on the nature of the solution. With an increase in H + ion concentration, the solution becomes more acidic, while a decrease of H + ion causes an increase in the basicity of the solution.

Question 3: Do basic solutions also have H + (aq) ions? If yes, then why are these basic?

Answer: Yes, basic solutions also have H + ions, but they are basic in nature due to a greater number of OH – ions than the H + ions.

Question 4: Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?

Answer: If the soil is acidic in nature (PH below 7) then such field should be treated with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate).

Intext Questions (Page No. 34-35)

Question 1: What is the common name of the compound CaOCl 2 ?

Answer: CaOCl 2 (chemical name-calcium oxychloride) is commonly called bleaching powder.

Question 2: Name the substance which on treatment with chlorine yields bleaching powder.

Answer: Bleaching powder is prepared by treating Calcium hydroxide CaOH 2 with chlorine. The chemical equation for the reaction is:

Ca(OH) 2 + Cl 2 → CaOCl 2 + H 2 O

Question 3: Name the sodium compound which is used for softening hard water.

Answer: Sodium carbonate is commonly used for softening hard water.

Question 4: What will happen if a solution of sodium hydrogen carbonate is heated? Give the equation of the reaction involved.

Answer: When sodium hydrogen carbonate (NaHCO 3 ) is heated, sodium carbonate, water and carbon dioxide gas are obtained. The chemical equation for the reaction is

Question 5: Write an equation to show the reaction between Plaster of Paris and water.

NCERT Solutions for Class 10 Science Chapter 2 Exercise Questions

Question 1: A solution turns red litmus blue; its pH is likely to be: (a) 1 (b) 4 (c) 5 (d) 10

Answer: (d) 10

A solution which turns the colour of red litmus to blue must be basic in nature. A basic solution has a pH value of greater than 7. The only option with pH greater than 7 is 10 which will be the correct answer.

Question 2: A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains: (a) NaCl (b) HCl (c) LiCl (d) KCl

Answer : (b) HCl

Egg shells are made up of calcium carbonate, which on reaction with HCl liberates CO 2 gas. When CO 2 reacts with lime water (Ca (OH) 2 ), it forms calcium carbonate which gives the  solution a milky appearance.

CaCO 3 + 2HCl → CaCl 2 + H 2 O + CO 2

Ca(OH) 2 + CO 2 → CaCO 3 + H 2 O

Question 3: 10 ml of a solution of NaOH is found to be completely neutralized by 8 mL of a given solution of HCl. If we take 20 ml of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralize it will be: (a) 4 ml (b) 8 ml (c) 12 ml (d) 16 ml

Answer: (d) 16 ml

The amount of Hydroxide ions and hydrogen ions are directly proportional to the volume of their respective solutions. Hence, the problem can be solved by a unitary method.

Since 10 ml NaOH reacts with = 8 ml HCl

  16 ml of HCl solution will be required to completely neutralize 20 ml of NaOH solution.

Question 4: Which of the following types of medicines is used for treating indigestion? (a) Antibiotic (b) Analgesic (c) Antacid (d) Antiseptic

Answer: (c) Antacid

An antacid is used for the treatment of indigestion which is caused due to excessive acidity in the stomach. The antacid chemical is basic in nature and thus, it neutralizes the acidity in the stomach. 

Question 5: Write word equations and then balanced equations for the reaction taking place when (a) Dilute sulphuric acid reacts with zinc granules. (b) Dilute hydrochloric acid reacts with magnesium ribbon. (c) Dilute sulphuric acid reacts with aluminium powder. (d) Dilute hydrochloric acid reacts with iron filings.

Answer: (a) Sulphuric acid + Zinc → Zinc sulphate + Hydrogen

H 2 SO 4 (aq) + ZnS(s) → ZnSO 4 (aq) + H 2 (g)

(b) Hydrochloric acid + Magnesium → Magnesium chloride + Hydrogen

2HCl (aq) + MgS(s) → MgCl 2 (aq) + H 2 (g)

(c) Sulphuric acid + Aluminium → Aluminium sulphate + Hydrogen

3H 2 SO 4 (aq) + 2Al(s) → Al 2 (SO 4 ) 3 (aq) + 3H 2 (g)

(d) Hydrochloric acid + Iron Ferrous chloride + Hydrogen

6HCl (aq) + 2Fe(s) → 2FeCl 2 (aq) + 3H 2 (g)

Question 6: Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it.

Answer: Two nails are fitted on a cork and are kept in a 100 ml beaker. The nails are then connected to the two terminals of a 6-volt battery through a bulb and a switch. Some dilute HCl is poured into the beaker and the current is switched on. The same experiment is then performed with a glucose solution and an alcohol solution.

Observations:   It will be observed that the bulb glows in the HCl solution and does not glow in the glucose or alcohol solution.

Result:   HCl dissociates into H + and Cl – ions. These ions conduct electricity in the solution resulting in the glowing of the bulb. On the other hand, neither the glucose solution nor the alcohol solution dissociates into ions. Therefore, these two solutions do not conduct electricity.

Conclusion:  From this activity, it can be concluded that all acids generate hydrogen ions but not all compounds containing hydrogen are acids. That is why, though alcohols and glucose contain hydrogen, they are not categorized as acids.

Question 7: Why does distilled water not conduct electricity, whereas rainwater does?

Answer: Distilled water is a pure form of water and its pH is 7 and is devoid of any ionic species. Therefore, it does not conduct electricity. Rainwater, being an impure form of water, contains CO 2 , SO 2 , NO. These oxide gases react with water and get chemically converted into acids which are responsible for the release of ions that conduct electricity-contains many ionic species(acids) whose pH is less than 7 and therefore it conducts electricity

Question 8: Why do acids not show acidic behaviour in the absence of water?

Answer: The acidic behaviour from acids is because of the presence of hydrogen ions. Hydrogen ions can only be produced in the presence of water and therefore water is definitely needed if acids are to show their acidic behaviour.

Question 9: Five solutions A, B, C, D , and E , when tested with universal indicator, showed pH as 4, 1,11,7 and 9, respectively. Which solution is (a) neutral? (b) Strongly alkaline? (c) Strongly acidic? (d) Weakly acidic? (e) Weakly alkaline? Arrange the pH in increasing order of hydrogen-ion concentration.

Answer: At 25 o C pH of neutral solutions = 7

As the pH falls below 7, it denotes acidic character with a pH of 1 being highly acidic. When the pH goes above 7, it implies that the solution is basic with 14 being highly basic.

Neutral → Solution D with pH 7

Strongly→ alkaline Solution C with pH 11

Strongly acidic → Solution B with pH 1

Weakly acidic → Solution A with pH 4

Weakly alkaline→ Solution E with pH 9

The pH can be arranged in the increasing order of the concentration of hydrogen ions as: 11 < 9 < 7 < 4 < 1

Question 10: Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH 3 COOH) is added to test tube B. Amount and concentration taken for both the acids are same. In which test tube will the fizzing occur more vigorously and why?

Answer: The fizzing will occur strongly in test tube A, in which hydrochloric acid (HCl) is added. This is because HCl is a stronger acid than CH 3 COOH and therefore produces hydrogen gas at a quicker rate due to which fizzing occurs more vigorously in test tube A.

Mg + 2HCl → MgCl 2 + H 2 ↑ (faster)

Mg + 2CH 3 COOH → Mg(CH 3 COO) 2 + H 2 ( slower)

Question 11: Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer.

Answer: The pH of milk is 6. As it gets converted to curd (pH between 4.5 to 5.5) the pH will reduce because curd has lactic acid which is more acidic in nature. Thus, the pH drops below 6 when milk gets converted to curd.

  Question 12: A milkman adds a very small amount of baking soda to fresh milk. (a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline? (b) Why does this milk take a long time to set as curd?

Answer: (a)  He shifted the pH of the fresh milk from 6 to slightly alkaline to prevent milk from getting sour due to production of lactic acid.

(b)  This milk takes long time to set into curd because the lactic acid produced here first neutralises the pH then the pH is reduced to turn milk to curd.

Question 13: Plaster of Paris should be stored in a moisture-proof container. Explain why?

Answer: Plaster of Paris (POP) should be stored in a moisture-proof container because Plaster of Paris, a powdery mass, absorbs water (moisture) to form a hard solid known as gypsum.

Question 14: What is a neutralization reaction? Give two examples.

Answer: A reaction in which an acid and a base react with each other to give a salt and water is termed as a neutralization reaction. In this reaction, energy is evolved in the form of heat and thus, such reactions are usually exothermic by nature.

(ii) During indigestion (caused due to the production of excess of hydrochloric acid in the stomach), we administer an antacid (generally milk of magnesia, MgOH 2 which is basic in nature). The antacid neutralizes the excess acid and thus gives relief from indigestion.

Mg(OH) 2 + 2HCl → MgCl 2 + 2H 2 O

Question 15: Give two important uses of washing soda and baking soda.

Answer: Two important uses of washing soda are as follows: (i) It is used in glass, soap, and paper industries. (ii) It is used to remove the permanent hardness of the water.

Two important uses of baking soda are as follows:

(i) It is used in baking industries. Baking powder is a mixture of baking soda and a mild acid known as tartaric acid. When it is heated or mixed with water, it releases CO 2 that makes bread or cake fluffy.

(ii) It is used in soda-acid fire extinguishers.

Topics covered under Class 10 Science Chapter 2 Acids, Bases And Salts

Below we have listed the topics discussed in NCERT Solutions for Class 10 Science Chapter 2. The list gives you a quick look at the different topics and subtopics of this chapter.

NCERT Solutions for Class 10 Science Chapter 2 – A Brief Discussion

Chapter Overview: In this chapter, you will learn about the chemical properties Acids, Bases and Salts. This chapter mainly describes the chemical nature of acids, bases and salts, their reaction with metals, non-metals and with each other. The chapter covers topics like the importance of pH in everyday life, the pH range of acidic, basic and neutral solution and the wide applications of pH scale. Further, you will learn the chemical formulae, chemical reactions of various important salts and their preparation which are used in day to day life such as washing and baking soda, bleaching powder, and plaster of Paris. This chapter has many practical experiments that help students to grasp the concepts more easily.

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NCERT Solutions for Class 10 Science Chapter 2: Topics

NCERT Solutions Class 10 Science Chapter 2 : The second chapter of NCERT Class 10 Science is Acids, Bases and Salts. It is a very important chapter since it covers the fundamental concepts of these components. It is also an interesting chapter as students will learn several fascinating chemical reactions, and primarily how acids, bases and salts function. The NCERT Solutions for Class 10 Science chapter 2 provides answers to the intext questions, which will further strengthen students’ base in the topics and help them write comprehensive answers.

The NCERT Solutions for Class 10 Science chapter 2 will also act as revision as students will practice questions on all the chapter topics. Students can also refer to Embibe 3D videos to understand the concepts, and access 1000+ sample questions to ace each topic. Continue reading to know more about NCERT Solutions for Class 10 Science chapter 2.

Practice All CBSE Class 10 Exercise Questions with Hints & Solutions Here!Pro Tip:   At Embibe, we believe that all students have the right to personalised guidance. Embibe offers personalised attention to all the CBSE Class 10 students to help them prepare for their exams and score good marks.

NCERT Solutions for Class 10 Science Chapter 2: Important Topics

Acids, Bases and Salts is one of the most interesting topic of Class 10 Science. Students gain deeper insights into the chemical reactions undergone by acids on metals, chemical properties and many more. Students will find it very interesting to learn and explore more about various reactions. It is advisable for the students to practice questions to be able to answer any type of question asked in the exam.

Embibe delivers the solutions for all the questions of NCERT Class 10 Science chapter 2 for. All the questions and concepts are based on the latest syllabus. Moreover, Embibe provides mo c k tests , NCERT 3D Videos, NCERT Exemplars, Embibe Explainers, etc., for. Students can view the topics taught in CBSE Class 10 Science chapter 2 as mentioned below:

NCERT Solutions for Class 10 Science Chapter 2: Points to Remember

To build a strong base in any chapter, students should be aware of the key factors in each topic. Knowing them makes it easier to write in-depth answers in the exam. Students can check the important points to remember from NCERT Class 10 Science chapter 2 as mentioned below:

• Indicator : (i) An indicator is a chemical substance which is used to indicate acidic or basic or neutral nature of an aqueous solution of a substance (ii) Indicators may be natural (litmus, turmeric and red cabbage,) or synthetic (phenolphthalein and methyl orange). Some indicators (onion paste, vanilla essence and clove oil) distinguish acids and bases with their odour. Such indicators are called olfactory indicators
• Acids: (i) Acids are the substances that dissociate in water to give hydrogen ions (H+) or hydronium ions (H3O+) (ii) Acids may be classified as: (a)  Organic  and  inorganic  acids (On the basis of source from which they are obtained). (b)  Strong  and  weak  acids (On the basis of their extent of dissociation in aqueous solution). (c)  Concentrated  and  dilute  acids (On the basis of their concentration in water).
• Acids taste sour and turn blue litmus to red. They are corrosive in nature. Their aqueous solutions conduct electricity.
• Acids react with metals to form salt and hydrogen gas.
• Acids react with metal carbonates and metal hydrogen carbonates to form salt, carbon dioxide and water.
• Acids react with basic metallic oxides to form salt and water.
• Bases: (i) Bases are the substances that dissociate in water to give hydroxide (OH–) ions. A base which is soluble in water is known as  alkali . (ii) Bases are classified as strong and weak bases on the basis whether they dissociate completely in water or not. (iii) Bases are bitter to taste and turn red litmus to blue. They are soapy in touch and corrosive in nature. They conduct electricity in aqueous medium. (iv)Bases react with some active metals like zinc on heating to form salt and hydrogen gas. (v)Non-metallic oxides being acidic in nature react with bases to form salt and water.

NCERT Solutions for Class 10 Science: All Chapters

Below-mentioned are the NCERT solutions for all the chapters of Class 10 Science.

• Chapter 1: Chemical Reactions & Equations
• Chapter 3: Metals and Non-Metals
• Chapter 4: Carbon and its Compounds
• Chapter 5: Periodic Classification of Elements
• Chapter 6: Life Processes
• Chapter 7: Control and Coordination
• Chapter 8: How do Organisms Reproduce?
• Chapter 9: Heredity and Evolution
• Chapter 10: Light, Reflection and Refraction
• Chapter 11: The Human Eye and Colourful World 
• Chapter 12: Electricity
• Chapter 13: Magnetic Effects of Electric Current
• Chapter 14: Sources of Energy
• Chapter 15: Our Environment
• Chapter 16: Management of Natural Resources

FAQs on NCERT Solutions for Class 10 Science Chapter 2

Below are some frequently asked questions on NCERT Solutions for Class 10 Science chapter 2:

Ans: Students can find mock tests for NCERT Class 10 Science chapter 2 on the Embibe app.

Ans: There are over 1000 practice questions on NCERT Class 10 Science chapter 2 on Embibe app.

Ans: The topics on which questions are asked in NCERT Solutions Class 10 Science chapter 2 are: -2.1 Understanding The Chemical Properties Of Acids And Bases -2.2 What Do All Acids And All Bases Have In Common? -2.3 How Strong Are Acids Or Base Solutions? -2.4 More About Salts.

Ans: The NCERT solutions for Acids, Bases, and Salts chapter provided by Embibe are prepared by top experts at Embibe to help students in Class 10 Chemistry preparation. Moreover, the solution helps the students complete their assignments. The students can score good marks in exams by referring to the solutions provided by Embibe. 

We hope this article on NCERT Solutions Class 10 Science chapter 2 was helpful to you. Stay tuned to Embibe for latest updates on Class 10 exam.

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Important Case Study Questions for CBSE Class 10 Science Exam 2024 with Answers

Download case study questions for class 10 science to prepare for the cbse board exam 2024. these multiple choice type questions with answers are published by the cbse board to provide sample questions to students..

CBSE Class 10 Science Case Study Questions 2024: Get here the questions based on case studies to practise for the CBSE Class 10 Science exam 2024. The CBSE Class 10 Science Question Bank on Case Studies, provided in this article, can be very helpful for understanding how the source based or case based questions are asked in the board exam. This question bank is published by the CBSE Board itself which makes it a very reliable source for the board exam preparations. Each question has five sub-questions with each followed by four options and a correct answer. Students can easily download these sample questions in PDF format and refer to the same for their exam preparations.

Note: Check the reduced CBSE Syllabus for Class 10 Science for 2024 Exam and then practise the case study questions accordingly for the CBSE Class 10 Board Exam 2024.  

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SCIENCE- Class X

Sample Case Studies

1. Read the following and answer any four questions from 1.1 to 1.5:

Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.

1.1 The substance not likely to contain CaCO 3 is

a) Dolomite

b) A marble statue

c) Calcined gypsum

d) Sea shells.

Answer: c) Calcined gypsum

1.2 A student added 10g of calcium carbonate in a rigid container, secured it tightly and started to heat it. After some time, an increase in pressure was observed, the pressure reading was then noted at intervals of 5 mins and plotted against time, in a graph as shown below. During which time interval did maximum decomposition took place?

a) 15-20 min

b) 10-15 min

c) 5-10 min

Answer: d) 0-5 min

1.3 Gas A, obtained above is a reactant for a very important biochemical process which occurs in the presence of sunlight. Identify the name of the process -

a) Respiration

b) Photosynthesis

c) Transpiration

d) sphotolysis

Answer: b) Photosynthesis

1.4 Marble statues are corroded or stained when they repeatedly come into contact with polluted rain water. Identify the main reason.

a) decomposition of calcium carbonate to calcium oxide

b) polluted water is basic in nature hence it reacts with calcium carbonate

c) polluted water is acidic in nature hence it reacts with calcium carbonate

d) calcium carbonate dissolves in water to give calcium hydroxide.

Answer: c) polluted water is acidic in nature hence it reacts with calcium carbonate

1.5 Calcium oxide can be reduced to calcium, by heating with sodium metal. Which compound would act as an oxidizing agent in the above process?

b) sodium oxide

d) calcium oxide

Answer: d) calcium oxide

2. Read the following and answer any four questions from 2.1 to 2.5:

The reaction between MnO2 with HCl is depicted in the following diagram. It was observed that a gas with bleaching abilities was released.

2.1 The chemical reaction between MnO 2 and HCl is an example of:

a) displacement reaction

b) combination reaction

c) redox reaction

d) decomposition reaction

Answer: c) redox reaction

2.2 Chlorine gas reacts with _______ to form bleaching powder.

a) dry Ca(OH) 2

b) dil. solution of Ca(OH) 2

c) conc. solution of Ca(OH) 2

Answer: a) dry Ca(OH) 2

2.3 Identify the correct statement from the following:

a) MnO 2 is getting reduced whereas HCl is getting oxidized

b) MnO 2 is getting oxidized whereas HCl is getting reduced.

c) MnO 2 and HCl both are getting reduced.

d) MnO 2 and HCl both are getting oxidized.

Answer: a) MnO 2 is getting reduced whereas HCl is getting oxidized

2.4 In the above discussed reaction, what is the nature of MnO 2 ?

a) Acidic oxide

b) Basic oxide

c) Neutral oxide

d) Amphoteric oxide

Answer: b) Basic oxide

2.5 What will happen if we take dry HCl gas instead of aqueous solution of HCl?

a) Reaction will occur faster.

b) Reaction will not occur.

c) Reaction rate will be slow.

d) Reaction rate will remain the same.

Answer: b) Reaction will not occur.

Also, check below other important study material released by the CBSE Board:

CBSE Class Maths Case Study Questions for All Chapters (Published by CBSE)

MCQs for Class 10 English Footprints without Feet (Published by CBSE)

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Assertion and Reason Questions for Class 10 Science Chapter 2 Acids, Bases and Salts

• Last modified on: 5 months ago
• Reading Time: 23 Minutes

Table of Contents

Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true.

Q.1. Assertion (A) : The acid must always be added to water with constant stirring. Reason (R) : Mixing of an acid with water decreases the concentration of H+ ions per unit volume.

Q.2. Assertion (A) : Copper sulphate crystals are wet because it contains water of crystallisation. Reason (R) : Water of crystallisation is the fixed number of molecules of water present in one formula unit of salt.

Q.3. Assertion (A) : The aqueous solutions of glucose and alcohol do not show acidic character. Reason (R) : Aqueous solutions of glucose and alcohol do not give H+ ions.

Q.4. Assertion (A) : HCl gas does not change the colour of dry blue litmus paper. Reason (R) : HCl gas dissolves in the water present in wet litmus paper to form H+ ions.

Q.5. Assertion (A) : Weak acids have low electrical conductivity. Reason (R) : Strong acids and weak acids have equal concentration of hydrogen ions in their solutions.

Also read: Case Study Questions for Class 10 Science Chapter 2 Acids, Bases and Salts

Q.6. Assertion (A): Pure water is neither acidic nor basic. Reason (R) : The pH of a solution is inversely proportional to the concentration of hydrogen ions in it.

Q.7. Assertion (A) : During electrolysis of concentrated aqueous solution of sodium chloride, hydrogen is produced at anode and chlorine gas is produced at cathode. Reason (R) : Ions get attracted to oppositely charged electrodes.

Q.8. Assertion (A) : Baking powder is used in making cake instead of using only baking soda. Reason (R) : Baking powder contains tartaric acid which reacts with sodium carbonate and removes bitter taste.

Q.9. Assertion (A) : The chemical formula of bleaching powder is CaOCI. Reason (R) : Calcium oxide reacts with chlorine to form bleaching powder.

Q.10. Assertion (A): Plaster of Paris is stored in a moisture proof container. Reason (R) : Plaster of Paris sets into a hard mass on wetting with water to form anhydrous calcium sulphate.

Q.11. Assertion (A): The chemical name of bleaching powder is calcium oxychloride. Reason (R): Bleaching powder is used as an oxidising agent in chemical industries.

Q.12. Assertion: The process of dissolving an acid or a base in water is highly exothermic reaction. Reason: Water must always be added slowly to acid with constant stirring.

Q.13. Assertion : Phenolphthalein is an acid-base indicator. Reason: Phenolphthalein gives different colours in acidic and basic medium.

Q.14. Assertion: Calcium sulphate hemihydrate, CaSO 4 .1/2 H 2 0 is called plaster of Paris. Reason: Plaster of Paris is used for producing moulds for pottery and ceramics and casts of statues.

Q.15. Assertion : pH = 7 signifies pure water. Reason: pH of acetic acid is greater than 7.

Q.16. Assertion : HCl is a stronger acid than acetic acid. Reason: On dissociation, HCl yields lesser hydrogen ions for the same concentration as compared to acetic acid.

Q.17. Assertion : pH of ammonium nitrate solution is acidic. Reason: Solution of a salt of weak base and strong acid is acidic.

Q.18. Assertion : Phosphoric acid is a weak acid. Reason : Phosphoric acid when dissolved in water dissociates partially and produces very little H* ions.

Q.19. Assertion : Antacids neutralize the effect of extra acid produced in the stomach during indigestion and thus provide relief. Reason: Antacids are mild bases.

Q.20. Assertion : Acetic acid does not act as an acid in benzene solution. Reason: Benzene is non-polar.

Q.21. Assertion : Bleaching powder reacts with dilute acids to evolve chlorine. Reason: The chlorine liberated by the action of dilute acids on bleaching powder is called available chlorine.

Q.22. Assertion : Sodium carbonate pentahydrate is also known as washing soda. Reason: Chief raw materials for the manufacture of washing soda are NH 3 , NaCl and CaCO 3 .

Q.23. Assertion: Common salt is used for the preparation of many chemicals such as sodium hydroxide, bleaching powder, baking soda, washing soda etc. Reason : Main source of sodium chloride is sea water.

Q.24. Assertion : AlCl 3 is a basic salt. Reason: AlCl 3 is a salt of strong acid and a weak base.

Q.25. Assertion : Baking soda is prepared by chlor-alkali process. Reason: Brine decomposes to sodium hydroxide on passing electricity through it.

Q.26. Assertion : Salt of KNO 3 is formed by strong base and weak acid. Reason: Salt of NH 4 Cl is formed by weak base and strong acid.

Q.27. Assertion : Strength of the acid or base decreases with dilution. Reason: Ionization of an acid or a base increases with dilution.

Q.28. Assertion : Higher the H ion concentration, lower is the pH value. Reason: The pH of a neutral solution=7, that of a basic solution < 7 and that of an acidic solution > 7.

Q.29. Assertion : CH 3 COOH is used as vinegar in cooking and food preservatives. Reason: Strong acids are those acids which ionise almost completely in aqueous solution and hence produce a large amount of Hions.

Q.30. Assertion : Tooth decay starts when the pH of the mouth is lower than 5.5. Reason: Enamel starts corroding below 5.5 pH.

Related Posts

Frequently Asked Questions (FAQs) on Acids, Bases and Salts Assertion Reason Questions

A1: The best website for practicing assertion reason questions for class 10 science is physicsgurukul.com

A2: Yes, we have provided many questions in each chapter. So it is sufficient for practice.

A3: Assertion reason questions consists of two statements – Assertion and Reason Assertion (A):   This is a statement that could be a fact, an observation, or a conclusion. Reason (R): This explains why the assertion is true (or false). You need to analyze both statements and determine the relationship between them.

A4: Here are some tips for effective answering the assertion and reason questions. 1. Read both the Assertion and Reason carefully. 2. Think logically about the scientific concept involved. 3. Even if the Assertion sounds familiar, analyze it with the Reason provided. 4. Don’t be fooled by a partially true Reason. 5. Practice with sample questions from your textbook or other resources.

A5: Yes, Physics Gurukul provides assertion reason questions for all subjects. Click here to access assertion reason questions for all classes and subjects.

A6: Acids are substances that release hydrogen ions (H⁺) when dissolved in water. They have a sour taste, turn blue litmus paper red, and have pH values less than 7.

A7: Common acids include hydrochloric acid (HCl) found in gastric juice, citric acid found in citrus fruits like lemons and oranges, acetic acid found in vinegar, and sulfuric acid used in car batteries.

A8: Bases are substances that release hydroxide ions (OH⁻) when dissolved in water. They have a bitter taste, feel slippery to the touch, turn red litmus paper blue, and have pH values greater than 7.

A8: Common bases include sodium hydroxide (NaOH) used in drain cleaners and soap making, potassium hydroxide (KOH) used in fertilizers and industrial processes, and calcium hydroxide [Ca (OH)₂] used in cement and agriculture.

A10: The pH scale is a measure of the acidity or basicity of a solution. It ranges from 0 to 14, where 7 is considered neutral, values below 7 indicate acidity, and values above 7 indicate alkalinity.

A11: Neutralization is a chemical reaction between an acid and a base to form salt and water. In this reaction, the H⁺ ions from the acid combine with the OH⁻ ions from the base to form water, while the remaining ions form the salt.

A12: Antacid tablets contain basic substances like magnesium hydroxide or calcium carbonate. When these tablets are consumed, they react with the excess acid in the stomach, neutralizing it and providing relief from acidity.

A13: pH plays a crucial role in various everyday processes, such as digestion in the human body, water treatment, agriculture (soil pH affects plant growth), and the manufacturing of various products like cosmetics and food items.

A14: The pH of a solution can be determined using pH indicators, pH paper/strips, or pH meters. pH indicators change color depending on the acidity or basicity of the solution, while pH paper/strips provide a numerical pH value, and pH meters directly measure pH electronically.

A15: Acid rain, which is formed when sulfur dioxide and nitrogen oxides react with water in the atmosphere, can lead to the acidification of water bodies, soil degradation, damage to vegetation, and corrosion of buildings and monuments.

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8 thoughts on “ Assertion and Reason Questions for Class 10 Science Chapter 2 Acids, Bases and Salts ”

are these correct

Yes, but if any answer is wrong. Then pl report. We will make necessary corrections.

yes thats all right except one i.e. formula of bleaching powder is give caocl but it is caocl2.

The second answer is wrong

Assertion is wrong. Copper sulphate is not wet. It is an hydrated salt, as it contains water molecules. Assertion is false and Reason is true.

Answer of Q 4 is wrong the answer should be option b The reason doesn’t satisfy the assertion

It makes me happy for my preparation for preboards

Please give explanation of these assertions and reasons questions.

Leave a Reply Cancel reply

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CBSE Class 10th - SCIENCE : Chapterwise Case Study Question & Solution

In board exams, students will find the questions based on assertion and reasoning. Also, there will be a few questions based on case studies. In that, a paragraph will be given, and then the MCQ questions based on it will be asked. For Science subjects, there would be 5 case-based sub-parts questions, wherein a student has to attempt 4 sub-part questions.

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• CBSE Board 10th Mid Term Exam 2024-25 : Most Important English Grammar Question with Answers 31 August, 2024, 5:43 pm
• CBSE Board Class 10th Mid Term Exam 2024-25 : Maths Most Important MCQs with Answers 30 August, 2024, 4:38 pm
• CBSE Announces Online Marks Verification for Class 10 Supplementary Exams; Apply Online Beginning August 9 6 August, 2024, 10:45 am
• CBSE 10th Compartment Result 2024 Out: CBSE Class 10 Supplementary Results Released, Direct Link Here 5 August, 2024, 3:50 pm
• CBSE 10th Compartment Result 2024: CBSE to Release Class 10 Compartment Results Soon; Check Details Here 5 August, 2024, 3:28 pm
• When to Expect CBSE Class 10 Supplementary Results 2024? 3 August, 2024, 10:50 am
• CBSE 10th Exam 2024-25 : Mathematics (Volume-4) Official Competency Focused Practice Questions released by CBSE 1 August, 2024, 6:31 pm
• CBSE Class 10 Results 2024 : CBSE Class 10 Answer Book Photocopy Applications Open 4 June, 2024, 6:17 pm
• CBSE 10th 2024-25 : Social Science Official Competency Focused Practice Questions released by CBSE 28 May, 2024, 4:12 pm

CBSE Board 10th Mid Term Exam 2024-25 : Most Important English Grammar Question with Answers

As CBSE Class 10 Mid Term and Half Yearly Exams approach, mastering English grammar is crucial. Strong grammar skills improve writing clarity, comprehension, and overall scores. This article provides essential grammar questions and answers to help you prepare effectively. Review these key points to excel in your exams and enhance your performance.

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Notes of Ch 2 Acids, Bases and Salts | Class 10th Science

Study material and notes of ch 2 acids, bases and salts class 10th science.

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CBSE Class 6 Science

CBSE Class 6 Science is the first step in secondary education. It is a base year in which you will explore the natural world and gain an in-depth knowledge of scientific concepts. 

In CBSE class 6, science students learn about various themes, such as plants, animals, matter, and energy. These themes are summarized into 16 chapters, and every chapter is crafted so that students can easily understand the scientific principles. 

You will be prepared for future examinations if you master the CBSE Class 6 Science concepts. Therefore, in this blog, we have provided information about class 6 science, the topics you will cover, and the list of important topics of CBSE Class 6 science.

• 1.0 CBSE Class 6 Science Guide

As we know, class 6 is the foundation stage, and the concepts of science you will study are the foundation for understanding detailed information in higher grades.  In CBSE class 6 science, you will learn about living organisms, plants, animals, matter, energy, etc.

To get a good grasp of the scientific principles and concepts, you need to pay full attention to CBSE Class 6 Science from the very start.

• 2.0 CBSE Class 6 Science Syllabus

Considering that all information on the various branches of science has been covered, the CBSE has crafted the Class 6th Science Syllabus. It covers Physics, Biology, and Chemistry. There is no information about the updated Syllabus, but as per the 2023-24 session, the CBSE Class 6 science syllabus consists of 16 chapters. These will ensure a complete understanding of the subjects.

Below, we have provided the CBSE Class 6 Science Syllabus:

• 3.0 CBSE Class 6 Science Sample Paper

You have fully understood the concepts and principles of CBSE class 6 science, but as we know, practice makes a man perfect. To perfect yourself in science, you need to practice different questions related to different topics.

CBSE Class 6 Sample Papers are necessary resources that will help. These sample papers ensure that you understand the exam pattern, marking schemes, and high-weighted topics. It enables you to gain the confidence that you need during your exam.

• 4.0 CBSE Class 6 Science Textbook

To excel in your CBSE class 6 exam, it is important to use the Class 6 science textbooks. These books provide you with a deep understanding of scientific principles.

Class 6 CBSE Textbooks have been designed in a very creative, colourful way, including diagrams, which increase the student's understanding. 

Below, we have listed the latest edition of the Science textbook published by the National Council of Educational Research and Training (NCERT). All chapters are aligned with the most recent CBSE syllabus for Class 6 Science. 

• 5.0 CBSE Class 6 Science Preparation Tips

Find the important tips to prepare for the CBSE Class 6 Science exam and excel in it with good marks.

• Understand the subjects included in the Class 6 Science syllabus.
• Focus on understanding the main scientific ideas instead of just memorizing facts.
• Read NCERT textbooks for clear explanations and helpful pictures.
• Try hands-on experiments to connect what you learn in theory with real-life applications.
• Work on sample papers and past questions to get a feel for the exam style.
• Set aside time to review what you’ve learned to help remember it better.
• Join study groups or talk with classmates to ask questions and share knowledge.
• Stay Curious: Explore topics outside the syllabus to deepen your understanding.
• 6.0 Additional Books of CBSE Class 6 Science for Reference

Here is a list of some additional books that will help you understand the CBSE class 6 science concepts and provide you with enough information to grasp a particular topic. 

• S. Chand ( For all three subjects: Physics, Chemistry and Biology ) 
• Arihant All In One Science Class 6th
• New Oxford Modern Science Chemistry for ICSE 6 by John West
• It’s All About ICSE Biology for Middle School Class – 6 by A.P. Mishra
• ICSE Physics, Chemistry and Biology for Class 6 by Full Marks
• 7.0 NCERT CBSE Class 6 Science: Chapter-wise Weightage/Important Topics

Understanding the chapter-wise weightage is crucial for effective exam preparation, as it helps students prioritize their study time. The weightage mentioned is indicative and may vary based on the specific guidelines provided by CBSE for the academic year. Therefore, students should focus on grasping the concepts and practising questions from each chapter, particularly those with greater significance. By engaging with important topics, students can enhance their understanding and retention, improving their assessment performance and ensuring they are well-prepared for their exams.

Table of Contents

CBSE Class 6 Science comprises a wide range of topics, all of which introduce the subject: food, plants, animals, matter, and energy.

If one wants the students to prepare well, the things that must be emphasised are based on understanding the key concepts, practising important questions, and using resources like NCERT solutions and sample papers.

Students can get free PDFs of important questions, NCERT solutions, and different online educational platforms that provide study material based on the CBSE syllabus.

The basics necessary for higher education in science are well laid through Class 6 Science, which creates a well-built base for critical thinking and solving problems—a base necessary to go for the complex scientific concepts in later grades.

• The Human Eye and the Colourful World Class 10 Case Study Questions Science Chapter 11

Last Updated on August 30, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 10 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 10 science. In this article, you will find case study questions for cbse class 10 science chapter 11 The Human Eye and the Colourful World.

Table of Contents

Case Study Questions on The Human Eye and the Colourful World

Question 1:

Read the following and answer the questions given below:

Light of all the colour travel at the same speed in vacuum for all wavelengths. But in any transparent medium (glass or water), the light of different colours travel with different speeds for different wavelength that means that the refractive index of a particular medium is different for different wavelength. As there is a difference in their speeds, the light of different colour bend through different angles. The speed of violet colour is maximum and the speed of red colour is minimum in glass so, the red light deviates least and violet colour deviates most. Hence, higher the wavelength of a colour of light, smaller the refractive index and less is the bending of light.

λ r > λ v  and r n < v n . Also frequency, ν = c/λ.

(i) Which of the following statements is correct regarding the propagation of light of different colours of white light in air? (a) Red light moves fastest. (b) Blue light moves faster than green light. (c) All the colours of the white light move with the same speed. (d) Yellow light moves with the mean speed as that of the red and the violet light.

Difficulty Level: Medium

Ans. Option (c) is correct. Explanation: All the colours of the white light move with the same speed in air.

(ii) Which of the following is the correct order of wavelength? (a) Red > Green > Yellow (b) Red > Violet > Green (c) Yellow > Green > Violet (d) Red > Yellow > Orange

Difficulty Level: Easy

Ans. Option (c) is correct. Explanation: The increasing order of wavelength of visible spectrum is Violet < Indigo < Blue < Green < Yellow < Orange < Red So, the correct order is Yellow > Green > Violet

(iii) Which of the following is the correct order of speed of light in glass? (a) Red > Green > Blue (b) Blue > Green > Red (c) Violet > Red > Green (d) Green > Red > Blue

Ans. Option (b) is correct. Explanation: The more be the wavelength, more be the speed.

(iv) Which colour which has maximum frequency (a) Red (b) Violet (c) Blue (d) Green

Ans. Option (b) is correct. Explanation: Frequency is inversely proportional to the wavelength. Violet has minimum wavelength among all these colours, so violet has maximum frequency.

(v) Which of the following is the correct order of angle of deviation? (a) Red > Green > Blue (b) Blue > Yellow > Orange (c) Orange > Red > Green (d) Blue > Green > Violet

Ans. Option (b) is correct. Explanation: The angle of deviation is more for more refractive index.

Question 2:

The spreading of light by the air molecules is called scattering of light. The light having least wavelength scatters more. The sun appears red at sunrise and sunset, appearance of blue sky it is due to the scattering of light. The colour of the scattered light depends on the size of particles. The smaller the molecules in the atmosphere scatter smaller wavelengths of light. The amount of scattering of light depends on the wavelength of light. When light from sun enters the earth’s atmosphere, it gets scattered by the dust particles and air molecules present in the atmosphere. The path of sunlight entering in the dark room through a fine hole is seen because of scattering of the sun light by the dust particles present in its path inside the room.

(i) To an astronaut in a spaceship, the colour of earth appears (a) red (b) blue (c) white (d) black

Ans. Option (b) is correct. Explanation: Light is scattered by the air molecules present in atmosphere.

(ii) At the time of sunrise and sunset, the light from sun has to travel. (a) longest distance of atmosphere (c) both (a) and (b) (b) shortest distance of atmosphere (d) can’t say

Ans. Option (a) is correct. Explanation: As the distance between us and sun is more at the time of sunrise and sunset.

(iii) The colour of sky appears blue, it is due to the (a) refraction of light through the atmosphere (b) dispersion of light by air molecules (c) scattering of light by air molecules (d) all of these.

Ans. Option (c) is correct. Explanation: Due to the more scattering of blue colour by molecules of air.

(iv) At the time of sunrise and sunset (a) Blue colour scattered and red colour reaches our eye (b) Red colour scattered and blue colour reaches our eye (c) Green and blue scattered and orange reaches our eye (d) None of these

Ans. Option (a) is correct. Explanation: Red light being of largest wavelength blue scatter more, red scattered least.

(v) The danger signs made red in colour, because (a) the red light can be seen from farthest distance (b) the scattering of red light is least (c) both (a) and (b) (d) none of these

Ans. Option (c) is correct. Explanation: Scattering is least but velocity of red light is more.

• Electricity Class 10 Case Study Questions Science Chapter 12
• Metals and Non-metals Class 10 Case Study Questions Science Chapter 3
• Light – Reflection and Refraction Class 10 Case Study Questions Science Chapter 10
• Life Processes Class 10 Case Study Questions Science Chapter 6

Acids Bases and Salts Class 10 Case Study Questions Science Chapter 2

Chemical reactions and equations class 10 case study questions science chapter 1, topics from which case study questions may be asked.

• Structure of the Human Eye
• Functioning of the Eye
• Defects of Vision and Their Correction
• Prism and the Refractive Index
• Dispersion of Light
• Atmospheric Refraction
• Scattering of Light

Case study questions from the above topics may be asked.

Helpful Links for CBSE Class 10 Science Preparation

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• Download Chapter Test for CBSE Class 10 Science

Frequently Asked Questions (FAQs) on The Human Eye and the Colourful World Case Study Questions

Q1: what are case study questions for cbse examinations.

A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.

Q2: Why are case study questions important for understanding class 10 science chapters?

A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.

Q3: How should students approach answering case study questions for CBSE?

A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 10 science chapters for CBSE exams?

A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our  website  to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.

Q5: How can students effectively prepare for case study questions on The Human Eye and the Colourful World for CBSE exams?

A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.

Q6: How can teachers incorporate case study questions on The Human Eye and the Colourful World class 10 science into classroom teaching?

A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of The Human Eye and the Colourful World.

Q7: What is the power of accommodation of a normal eye?

Ans. A normal eye has a power of accommodation which enables objects as far as infinity and as close as 25 cm to be focussed on the retina.

Q8: What is meant by spherical aberration of a lens?

A8: The inability of a lens to bring all the rays coming from a point object to focus at a single point is known as spherical aberration.

Q9: Is the focal length of our eye lens fixed?

Q10: what is astigmatism how is it corrected.

A10: It is that defect of the eye due to which the image of a distant point source of light is formed, not as a point but as a vertical or a horizontal line. It can be corrected by using cylindrical lenses.

Q11: White light consists of seven colours. Is the refractive index of glass same for all colours?

A11: The refractive index of glass is different for each of the colours.

Q12: When a monochromatic light passes through a prism, will it show dispersion?

A12: No, it will not show any dispersion but will show only deviation.

Q13: When does an object appear black?

A13: When it absorbs all the colours incident on it.

Q14: Why does a rose appear red in daylight?

A14: Because it reflects only red colour to our eye, out of all the seven colours of sun light falling on it.

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