Acids, Bases and Salts
Multiple Choice Questions
1. What happens when a solution of an acid is mixed with a solution of a base in a test tube?
The temperature of the solution increases
The temperature of the solution decreases
(iii) The temperature of the solution remains the same
Salt formation takes place
(i) only (b) (i) and (iii)
(ii) and (iii) (d) (i) and (iv)
2. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
Ammonium hydroxide solution
3. 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
4. Which of the following salts does not contain water of crystallisation?
Sodium carbonate is a basic salt because it is a salt of
strong acid and strong base
weak acid and weak base
strong acid and weak base
weak acid and strong base
Calcium phosphate is present in tooth enamel. Its nature is
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?
Which of the following gives the correct increasing order of acidic strength?