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Q. Ozone in stratosphere is depleted by

Bihar CECEBihar CECE 2010Environmental Chemistry

Solution:

Chlorofluorocarbons (CFCs or freons like $ C{{F}_{2}}/C{{l}_{2}} $ ) are responsible for depletion of the ozone layer in the upper strata of atmosphere. They are stable and inert compounds. They absorb UV-rays and break down liberating free atomic chlorine which causes depletion of ozone through free radical reaction.
$\dot{ C } l + O _{3} \longrightarrow Cl \dot{ O }+ O _{2}$
$Clo ^{\circ}+ O _{3} \longrightarrow \dot{ C }+2 O _{2}$