Assertion :Chlorine sinks are formed during summer, hence, preventing ozone depletion. Reason: In summer season, nitrogen dioxide and methane react with chlorine monoxide and chlorine radicals.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Chlorine sinks is the process which involves removal of free electrons present in stratosphere. Nitrogen dioxide and methane react with chlorine atom to form Cl sinks.
$C l O (g) + N O_{2} (g) \to C L O N O_{2} (g)$
$C l (g) + C H_{4} (g) \to C H_{3} (g) + H C l (g)$

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