Complete guide to "Acids, Bases and Salts" for Chemistry students. Below you will find important questions and model answers to help you prepare.
We are building a dedicated quiz for this topic, but you can test your skills on a similar concept: NCERT-X: Chemical Reactions and Equations - Practice Set 1.
What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) The temperature of the solution increases
(ii) The temperature of the solution decreases
(iii) The temperature of the solution remains the same
(iv) Salt formation takes place
(i) only
(i) and (iii)
(ii) and (iii)
(i) and (iv)
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
Baking powder
Lime
Ammonium hydroxide solution
Hydrochloric acid
During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to
absorb the evolved gas
moisten the gas
absorb moisture from the gas
absorb Cl– ions from the evolved gas
Which of the following salts does not contain water of crystallisation?
Blue vitriol
Baking soda
Washing soda
Gypsum
What will be the action of the following substances on litmus paper? Dry HCl gas, Moistened NH₃ gas, Lemon juice, Carbonated soft drink, Curd, Soap solution.
Dry HCl gas: Turns blue litmus red Moistened NH₃ gas: Turns red litmus blue Lemon juice: Turns blue litmus red Carbonated soft drink: Turns blue litmus red Curd: Turns blue litmus red Soap solution: Turns red litmus blue