set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

When iron is left exposed to open air, it gets rusted. Which constituent(s) of air is /are responsible for rusting iron?

1. Oxygen gas present in the air
2. Moisture present in the air
3. Carbon dioxide gas present in the air

a) (i) and (ii)

b) (i) only

c) (ii) only

d) (ii) and (iii)

Question : 2

Which of the following is the electron configuration of a metallic element?

a) 2, 8, 7

b) 2, 8, 8

c) 2, 8

d) 2, 8, 8, 2

Question : 3

Assertion (A):
Sodium metal is stored under kerosene.
Reason (R):
Metallic sodium melts when exposed to air.

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

Alumina is chief ore of which of the following metal?

a) Ca

b) Na

c) K

d) Al

Question : 5

Which of the following is not a atomic characteristics of metal –

a) ductile

b) malleable

c) electropositive nature

d) none of these

Question : 6

In which of the following industries is mica used as a raw material?

a) Toys

b) Glass and pottery

c) Iron and steel

d) Electrical