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Question

Which of the following does not affect ozone layer
  1. CH2Cl
  2. NO
  3. Cl2
  4. CFCl3

A
Cl2
B
CFCl3
C
CH2Cl
D
NO
Solution
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CFCl3 is a chlorofluorocarbon (CFC). CFCl3 and CH2Cl release chlorine radicals which cause degradation of ozone molecules. Chlorine radicals are not degraded and remain in the atmosphere. So, they attack other ozone molecules and degrade them. NO (Nitric oxide) is similar to CFC in degrading ozone. On the other hand, Cl2 is just chlorine gas which has no effect on the ozone layer.
So, the correct answer is 'Cl2'.

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