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Which one of the following is mainly responsible for depletion of ozone layer?
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The correct answer is:
Chlorofluorocarbons
Chlorofluorocarbons are responsible for the depletion of ozone layer as they provide Cl free radical which infact reacts with ozone and converts it into $\mathrm{O}_2$ as
$\mathrm{Cl}^{\bullet}+\mathrm{O}_3 \longrightarrow \mathrm{ClO}^{\bullet}+\mathrm{O}_2$
$\mathrm{Cl}^{\bullet}+\mathrm{O}_3 \longrightarrow \mathrm{ClO}^{\bullet}+\mathrm{O}_2$
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