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Question

Chlorofluorocarbons are effective scavengers for ozone due to:
  1. photolytic reaction of O2 producing Cl radicals
  2. photolytic decomposition of O3 producing O2
  3. photolytic production of oxides of nitrogen
  4. photolytic reaction of O3 and CFCs

A
photolytic production of oxides of nitrogen
B
photolytic decomposition of O3 producing O2
C
photolytic reaction of O2 producing Cl radicals
D
photolytic reaction of O3 and CFCs
Solution
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CFCs absorb UV radiations in stratosphere and liberate chlorine atoms which in turn destroy ozone layer.
CFCl3hvUvCFCl2+Cl
Cl+O3ClO+O2
ClO+(O)Cl+O2

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