Assertion :Sulphur dioxide and chlorine are bleaching agents. Reason: Both are reducing agents.

Read the above assertion and reason and choose the correct option regarding it.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
${S O}_{2}$ in presence of moisture acts as a bleaching agent. This is due to the reducing nature of ${S O}_{2}$ . But bleaching action is only temporary.

$S O_{2} + 2 H_{2} O \to H_{2} S O_{4} + 2 [H]$

Similarity, ${C l}_{2}$ in pressure of moisture give out nascent oxygen (oxidation) and cause bleaching.

${C l}_{2} + H_{2} O \to 2 H C l + [O]$

Here, bleaching action is permanent.

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