set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Plaster of paris is obtained –

a) by adding sulphuric acid to calcium hydroxide

b) by heating gypsum to a very high temperature

c) by adding water to calcium sulphate

d) by heating gypsum to 373 K.

Question : 2

With reference to ionic compounds, consider the following statements.

1. Ionic compounds are insoluble in alcohol.
2. Ionic compounds in the solid state are a good conductor of electricity.

a) Only 2

b) Both 1 and 2

c) Only 1

d) Neither 1 nor 2

Question : 3

Assertion (A):
To dilute sulphuric acid, acid is added to water and not water to acid.
Reason (R):
Specific heat of water is very high.

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true

Question : 4

Which method is employed for obtaining a pure metal?

a) Magnetic separation

b) Froth floatation

c) Electrolytic refining

d) Gravity separation

Question : 5

The chemical formula of baking soda is

a) $NaHCO_3$

b) $CaCO_3$

c) $Ca(OH)_2$

d) $Na_2CO_3$

Question : 6

pH of human body varies within the range of

a) 5.5 to 5.8

b) 7.0 to 7.8

c) 6.0 to 6.5

d) 7.0 to 11.0