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Stratosphere contains a stable layer of ...

Stratosphere contains a stable layer of ozone molecules which absorbs UV radiation from the sun. The presence of ozone in atmosphere serves, as a shield to protect living organism on earth from the harmful effects of the solar ultraviolet radiation. The ultraviolet radiation are known to cause skin cancer. Ozone is formed in stratosphere by the following photochemical reactions.
`O_(2)(g)overset(UV)rarrO(g)+O(g)`
`O(g)+O_(2)(g)overset(UV)hArrO_(3)(g)`
Ozone is thormodhynamically unstable and ecomposes to molecular oxygen. Thus a dynamic equilibrium exits between the production and decomposition of ozone molecules.
The air pollutant which are responsible to deplete the ozone layer is

A

`SO_(2)`

B

`CO_(2)`

C

`CO`

D

Oxides of nitrogen and CFC's

Text Solution

Verified by Experts

The correct Answer is:
D
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Which of the following protects life on earth from harmful effects of UV radiations from sun?