set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Assertion (A):
In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group.
Reason (R):
In a group, the atomic radii generally increase from top to bottom.

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

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

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

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

Question : 2

Which of the following is a fundamental element?

a) Sand

b) Marble

c) Diamond

d) Sugar

Question : 3

Consider the following statements :

1. Solid NaCl conducts electricity.
2. Bauxite is purified by chemical separation.
3. Copper is purified by electrolytic refining.

a) 2 and 3

b) 1 and 3

c) 1 and 2

d) 1, 2 and 3

Question : 4

Match List-I with List-II :

a) 4 1 2 3

b) 3 2 1 4

c) 2 3 1 4

d) 3 1 2 4

Question : 5

$H_2O$ is liquid and $H_2S$ is a gas because

a) atomic radius of oxygen is less than that of sulphur.

b) oxygen is less electronegative than sulphur.

c) oxygen forms stronger hydrogen bonding than sulphur.

d) atomic radius of oxygen is greater than that of sulphur.

Question : 6

Which of the following statements about diamond are correct?

1. It is used as a gem in jewellery because of its ability to reflect light.
2. It is good conductor of electricity.
3. It is used for cutting glass, marble stones and other hard materials.
4. It is used for drilling of rocks.

a) 1, 2 and 3

b) 2, 3 and 4

c) 1, 3 and 4

d) 2 and 4