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What is the correct statement about ozone layer depletion?

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Oxides of nitrogen do not react with ozone in stratosphere.

The problem of ozone depletion is more serious at poles.

Freons, chlorofluorocarbons are inert chemically and they do not react with ozone in stratosphere.

The problem of ozone depletion is less serious at poles.

answer is B.

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Detailed Solution

The 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 by Cl and ClO radicals.

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