nature of matter and composition - Category wise Question and Answer Practice Test with Solutions

Question : 16

The process used to separate oil and water is

a) separating funnel

b) distillation

c) sublimation

d) chromatography

Question : 17

Magnetism is most beneficial for separating

a) non-metallic solids and solids such as sulfur

b) magnetic solids and solids such as sulfur

c) gases and non-metallic liquids

d) non-magnetic solids from non-magnetic liquids

Question : 18

Which one of the following is not a mixture?

a) Baking soda

b) Tootpaste

c) Toilet soap

d) Vinegar

Question : 19 [NDA]

Which one of the following is not a mixture?

a) Milk

b) Air

c) Mercury

d) Cement

Question : 20

A mixture of common salt, sulphur, sand and iron filings is shaken with carbon disulphide and filtered through a filter paper. The filtrate is evaporated to dryness in a china dish. What will be left in the dish after evaporation?

a) Iron filings

b) Sulphur

c) Sand

d) Common salt