set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Antacids contain –

a) weak acid

b) strong base

c) weak base

d) strong acid

Question : 2

Plaster of Paris hardens by –

a) changing into CaCO₃

b) combining with water

c) giving of CO₂

d) giving out water

Question : 3

The chemical name of bleaching powder is

a) calcium oxychloride

b) calcium chloroxide

c) calcium chloride

d) none of above

Question : 4

Which among the following statements with regard to pH scale is/are correct?

1. It is a logarithmic scale.
2. The scale is limited to 0-14 because the ionic product of water is about $10^{-14}$
3. The lower the value of pH, the greater the acidity of the solution.

a) I and III only

b) I and II only

c) I, II and III

d) II only

Question : 5

Human stomach produces acid ‘X’ which helps in digestion of food. Acid ‘X’ is

a) hydrochloric acid

b) acetic acid

c) methanoic acid

d) citric acid

Question : 6

Goldsmiths uses aqua regia, which is prepared by mixing

a) Nitric acid and Hydrochloric acid

b) Sulphuric acid and Hydrochloric acid

c) Nitric acid and Sulphuric acid

d) Citric acid and Benzoic acid