Which of the following can catalyse decomposition of ozone in ozone layer?

C l

from decomposition of freon

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N O

formed near ozone layer due to interaction of

N_{2}

and

O_{2}

or during lighting

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Both (A) and (B)

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None of these

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Solution

The correct option is D Both (A) and (B)
A. Chlorine can destroy the ozone layer because it can act as a catalyst. Chlorine initiates the breakdown of ozone and combines with a freed oxygen to form two oxygen molecules.

B. Nitrous oxide, like CFCs, is stable when emitted at ground level, but breaks down when it reaches the stratosphere to form other gases, called nitrogen oxides, that trigger ozone-destroying reaction.

So the correct option is C

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