100+ Hard Chemistry Questions and Answers - 2

Question: 6

What is vulcanization?

Heating of natural rubber with sulphur to a definite temperature for a known period of time is known as vulcanization of rubber.

Question: 7

Mention the physical properties of ammonia?

It is a colourless gas with pungent smell.

It is lighter than water.

It is alkaline in nature and bring tears in eyes.

It is extremely soluble in water.

Question: 8

Metals act as good reducing agents. Why?

Metals are electropositive, ie. they have the tendency to donate electrons. Hence they act as electron donors, otherwise they act as reducing agents.

Question: 9

Give any four medicinal uses of sulphur?

It is used as a disinfectant, fungicide and germicide for destroying bacteria and fungi in plants.

It is used as antiseptic in skin ointments.

It is used in the preparation of sulpha drugs.

It is used in beauty parlours to give specific shapes to our hair.

Question: 10

What are amalgams?

Alloys of mercury with other metals are called amalgams.

Silver amalgam (Ag/Hg)

Tin amalgam (Sn/Hg)