Q.

Now a days, ozone thickness is decreasing in stratosphere due to which of the following reasons?  

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a

Action of UV rays on molecular O2
 

b

Cl atoms which act as catalyst are consumed in the degradation of ozone

c

Global warming causes melting of polar ice.  

d

Cl atoms formed from CFC due to UV rays degrades ozone

answer is D.

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Detailed Solution

Cl atoms formed from CFC due to UV rays in stratosphere act as catalyst in the degradation of O3 and they are not consumed in the reaction.
 

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Now a days, ozone thickness is decreasing in stratosphere due to which of the following reasons?