Assertion : $S O_{2}$ is a bleaching agent. Reason: Nascent oxygen causes bleaching.

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 C Assertion is correct but Reason is incorrect
$S O_{2}$ is a bleaching agent.
It reduces coloring matter to colorless.
The bleaching action of $S O_{2}$ is either due to formation of nascent hydrogen or due to formation of colorless sulphites and bisulphites.
Thus, assertion is correct but Reason is incorrect.

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