Acids Bases and...

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

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

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

Which of the following salts does not contain water of crystallisation?

Sodium carbonate is a basic salt because it is a salt of

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?

If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

Sodium hydrogen carbonate, when added to acetic acid, evolves a gas. Which of the following statements are true about the gas evolved?

(i) It turns lime water milky

(ii) It extinguishes a burning splinter

(iii) It dissolves in a solution of sodium hydroxide

(iv) It has a pungent odour