Question

Chlorofluorocarbons are effective scavengers for ozone due to:

• A. photolytic reaction of $O_2$ producing $Cl$ radicals
• B. photolytic decomposition of $O_3$ producing $O_2$
• C. photolytic reaction of $O_3$ and $CFCs$
• D. photolytic production of oxides of nitrogen

Answer 1

Answer: (C)

photolytic reaction of $O_3$ and $CFCs$

$CFCs$ absorb $UV$ radiations in stratosphere and liberate chlorine atoms which in turn destroy ozone layer.
$CFC{l}_3\underset{Uv}{\overset{hv}{\to }}CFC{l}_2^{\ast }+C{l}^{\ast }$
$C{l}^{\ast }+O_3\to Cl{O}^{\ast }+O_2$
$Cl{O}^{\ast }+\left(O\right)\to C{l}^{\ast }+O_2$