A decrease in the amount of ozone in the stratosphere is called depletion of ozone and it is caused by :

1. UV radiations of the sun
2. excessive use of detergents
3. burning coal and wood
4. Use of CFC compounds

Which is not a greenhouse gas ?

1. Carbon monoxide
2. Methane
3. Nitrous oxide
4. Carbon dioxide

The branch of chemistry that aims to design product/process which minimize the use and/or generation of pollution is :

1. Industrial chemistry
2. Green chemistry
3. Analytical chemistry
4. Biochemistry

Fill in the blanks:

(a) The pollutants such as NO₂, SO₂ and SO₃ dissolved in the moisture of air are the cause of ……………

(b) Excessive release of carbon dioxide in the atmosphere is the cause of …………… effect which produces global warming.

(c) Ozone layer prevents the harmful …………… radiation of the sun to reach the earth.

(d) Decrease in the concentration of ozone in the stratosphere is the cause of the formation of …………… holes.

(e) Ozone depletion is mainly caused by the active …………… atoms generated from CFC in the presence of UV radiation.