set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

The main constituents of pearl are

a) Aragonite and Conchiolin

b) Ammonium Sulphate and Sodium Carbonate

c) Calcium Carbonate and Magnesium Carbonate

d) Calcium Oxide and Ammonium Chloride

Question : 2

One of the constituents of amalgam is

a) iron

b) aluminium

c) copper

d) mercury

Question : 3

The form of carbon known as graphite

a) contains a higher percentage of carbon than diamond

b) is a better electrical conductor than diamond

c) is harder than diamond

d) has equal carbon-to-carbon distances in all directions

Question : 4

Formula of magnetite is

a) FeCO₃

b) Fe₂O₃

c) FeS₂

d) Fe₃O₄

Question : 5

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 : 6

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