CBSE Class 10 Chemistry Chapter 2 Important Questions and Answers: In this article, we are going to discuss the Important questions of CBSE Class 10 Chemistry Chapter 2 Acids, Bases and Salts. It is the second chapter in Unit I Chemical Substances - Nature and Behaviour.
The article covers important Multiple choice questions, Assertion Reason Questions along with their direction, Case study questions, Very short answer questions, Short Answer Questions and Long Answer questions. Calcium For Snow
These questions and answers have been specially curated by subject experts. Students should refer to these questions along with the CBSE Class 10 Science Sample Paper 2022-23 issued by the board.
Unit I: Chemical Substances - Nature and Behaviour
1.The colour of phenolphthalein in acidic medium is-
2. Generally, when certain metals react with an acid they release gas.
3.Milkiness of lime water disappear when excess CO2 is passed due to the formation of-
4. What is formed when zinc reacts with sodium hydroxide?
(a) Zinc hydroxide and sodium
(b) Sodium zincate and hydrogen gas
(c) Sodium zinc-oxide and hydrogen gas
(d) Sodium zincate and water
5.The common name for the substance used as antacid-
6. Rain is called acid rain when it's:
(a) pH falls below 7
(c) pH falls below 5.6
7.When you clean a metal vessel with tamarind the reaction taking place is:
Metaloxide+X-------- Salt+Water. What is X here?
8. Sodium hydroxide turns phenolphthalein solution
9.Sodium carbonate is a basic salt 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
(a) The substance is a base
(b) The substance is an acid
(c) The substance is a neutral substance
(d) Either (A) or (B)
DIRECTION: Each of these questions contains an Assertion followed by Reason. Read them carefully
and answer the question on the basis of following options. You have to select the one
that best describes the two statements.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d)A is false but R is true.
Reason(R) : Mixing of an acid with water decreases the concentration of H+ ions per unit volume.
Reason (R) :On strong heating , Copper sulphate crystals lose all the water of crystallisation and form anhydrous salt.
Assertion(A): The aqueous solution of glucose and alcohol do not show acidic character.
Reason(R ): Aqueous solution of glucose and alcohol do not give H+ ions .
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
Assertion(A): Weak acids have low electrical conductivity.
Reason(R ): Strong acids and weak acids have equal concentration of H+ ions in their solutions. CASE STUDY BASED QUESTIONS:
1 A copper vessel gets tarnished due to formation of an oxide layer on its surface. On rubbing lemon on the vessel, the surface is cleaned, and the vessel begins to shine again. This is due to the fact that it reacts with the acid present in lemon to form a salt 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.
1.Which of the following acids is present in lemon?
(a) Formic acid (b) Acetic acid (c) Citric acid (d) Hydrochloric acid
2.The nature of copper oxide is
a) acidic b) basic c) neutral d) amphoteric
3.Name the salt formed in the above reaction
a) copper carbonate b) copper chloride
c)copper citrate d) copper citrate
4.The phenomenon of copper getting tarnished is
a) corrosion b) rancidity c) displacement d)none of these
2 Taj Mahal, the seventh wonder of the world, is made of white stone. This white stone contains the same substance ‘A’ that is present in chalk powder and lime-stone. It is turning yellow due to polluted air. If it is cleaned by an acidic cleaner, a gas ‘B’ is released, which when passed through a solution ‘C’, forms the same substance which is present in the white stone that