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 Reason. 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?
| (a) NaHCO3 | (b) Na2CO3 | (c) NaOH | (d) NaCl |
Answer: (c) NaOH.
(ii) The compound, Y is
| (a) NaHCO3 | (b) Na2CO3 | (c) Na2CO3.10H2O | (d) NaCI |
Answer: (c) Na2CO3.10H2O
(iii) What is the nature of the solution formed by dissolving Y in water?
| (a) Alkaline | (b) Acidic | (c) Neutral | (d) It remains insoluble |
Answer: (a) Alkaline
(iv) Identify the compound, Z.
| (a) CO2 | (b) H2CO3 | (c) NaOH | (d) H2O |
Answer: (b) H2CO3
(v) Sodium carbonate is a basic compound because it is a salt of a
| (a) strong acid and strong base | (b) weak acid and weak base |
| (c) strong acid and weak base | (d) weak acid and strong base |
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
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