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

Question : 16

Compounds

a) contain only one type of element

b) can be separated by their physical properties

c) are the same as mixtures

d) are different kinds of atoms chemically combined with each other.

Question : 17 [CDS]

Which one of the following is not a mixture?

a) Baking soda

b) Tootpaste

c) Toilet soap

d) Vinegar

Question : 18

A pungent smell often present near the urinals is due to

a) ammonia

b) sulphur-di-oxide

c) chlorine

d) urea

Question : 19

Select the correct order of evaporation for water, alcohol, petrol and kerosene oil

a) petrol > alcohol > water > kerosene oil

b) water > alcohol > kerosene oil > petrol

c) alcohol > petrol > water > kerosene oil

d) petrol > alcohol > kerosene oil > water

Question : 20

When we put some crystals of potassium permanganate in a beaker containing water, we observe that after sometime whole water has turned pink. This is due to

a) sublimation of crystals

b) boiling

c) melting of potassium permanganate crystals

d) diffusion