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Q.

In the stratosphere, ozone is formed by the action of ____ on molecular oxygen.

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a

CO2

b

Cl.

c

CFC

d

UV

answer is D.

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Detailed Solution

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In the stratosphere, ozone is formed by the action of  UV on molecular oxygen. UV breaks O2 into two oxygen atoms. Each oxygen atom combines with an O2 to produce O3. Chlorine free radicles released from CFCs degrade ozone releasing molecular oxygen. 

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