The most serious air pollutant causing health hazard is

• Sulphur dioxide

• Carbon monoxide

• Ozone

• Nitrogen oxide

The green colour seen in firework displays is due to the chloride salt of

Kautilya's 'Artharshastra' mainly deals with

Rainbows are produced by when sunlight 

Which of the following is used in pencils?

The branch of medicine involving synthetic chemical compounds is

Bubbles of air rise up through liquids due to

The boiling point of liquids vary as

The largest source of pollution in the world is

Acid rain is caused due to pollution of atmosphere by

The most serious air pollutant causing health hazard is