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(a) Expand CFC.

(b) How does it reduce ozone to oxygen?

Explanation:

(a) Chloroflurocarbons (CFCs)

(b) In the stratosphere UV rays act on CFCs  releasing Cl (chlorine) atoms. Cl degrades ozone releasing molecular O2 (oxygen). Cl acts as catalyst, not consumed in the reaction. CFCs which are added in stratosphere have permanent effect on ozone layer.

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