Chemistry MCQs

Question 1

Diamonds are glittering and attractive because light incident on them undergoes

Accepted Answer

Multiple internal reflections

Answer

Highest refraction

Answer

Multiple surface reflections

Answer

Hundred percent transmission

Question 2

If lime water is kept in the air, it turns milky due to presence of :

Accepted Answer

Carbon dioxide

Answer

Nitrogen

Answer

Oxygen

Answer

Sulphurdioxide

Question 3

Diamond is harder than graphite because of :

Accepted Answer

Difference in layers of atoms

Answer

Tetrahedral structure of diamond

Answer

Difference of crystalline structures

Answer

None of these

Question 4

The gas used to extinguish fire is

Accepted Answer

Carbon dioxide

Answer

Neon

Answer

Nitrogen

Answer

Carbon monoxide

Question 5

Which among the following coal contains 90 per cent of carbon?

Accepted Answer

Anthracite

Answer

Bitumen

Answer

Lignite

Answer

Peat

Question 6

One carat of diamond is equal to

Accepted Answer

200 mg

Answer

100 mg

Answer

150 mg

Answer

250 mg

Question 7

Carbon dioxide is

Accepted Answer

A reducing agent

Answer

An oxidising agent

Answer

A dehydrating agent

Answer

A bleaching agent

Question 8

Hardest allotrope of carbon is

Accepted Answer

Diamond

Answer

Graphite

Answer

Coke

Answer

Lamp black

Question 9

Diamond is lustrous because

Accepted Answer

Its refractive index is high

Answer

It is colourless

Answer

It is hard

Answer

It is pure