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Answer:
Explain the role of UV radiation in formation of ozone with the help of a chemical reaction.
The high energy of UV radiations breakdown some molecules of O2 into atoms of oxygen. One atom of oxygen binds to one molecule of O to form O3.
Ozone prevents UV rays to reach earth surface.
O2 + U.V → O + O O2 + O → O3(Ozone)
Example : Chlorofluorocarbons
Name the pollutant and write its role in depletion of ozone layer.
Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. These are released by solvents, spray aerosols, refrigerators, air-conditioners, etc.
The molecules of chlorofluorocarbons in the stratosphere are broken down by the ultraviolet radiations and release chlorine atoms. These atoms react with ozone and destroy it.