Which of the following statements about the depletion of ozone...

Which of the following statements about the depletion of ozone layer is correct?

Options

AThe problem of ozone depletion is less serious at poles because $\mathrm{NO}_2$ solidifies and is not available for consuming $\mathrm{CIO}^{\circ}$ radicals.
BThe problem of ozone depletion is more serious at poles because ice crystals in the clouds over poles act as catalyst for photochemical reactions involving the decomposition of ozone of $\mathrm{Cl}^{\bullet}$ and $\mathrm{CIO}^{\bullet}$ radicals.
CFreons, chlorofluorocarbons, are inert. Chemically, they do not react with ozone in stratosphere.
DOxides of nitrogen also do not react with ozone in stratosphere.

Correct answer

C. Freons, chlorofluorocarbons, are inert. Chemically, they do not react with ozone in stratosphere.

Step-by-step solution

Freons and chlorofluorocarbon find their way to stratosphere through without being destroyed in the troposphere due to their low reactivity. In the stratosphere the

\mathrm{Cl}

and

\mathrm{Br}

atoms are liberated from the parent compounds by the action of ultraviolet light e.g.

\begin{aligned} \mathrm{CF}_{2} \mathrm{Cl}_{2}+h v \longrightarrow \mathrm{CF}_{2} \mathrm{Cl}+\mathrm{Cl}\\ &\mathrm{CFCl}_{3}+h v \longrightarrow \mathrm{CFCl}_{2}+ \mathrm{Cl} \end{aligned}

The \mathrm{Cl}$ atoms can destroy ozone molecules through a variety of catalytic cycles.

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