$S O_{2}$ act as a/an

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Oxidizing agent

Reducing agent

Bleaching agent

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answer is D.

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Detailed Solution

The oxidation state of sulfur in $S O_{2}$ is 4, which is intermediate. Thus, it can act as oxidizing agent as well as reducing agent.

The bleaching action of $S O_{2}$ is by reduction. It reduces the colored substance by removal of oxygen from it. Thus, the bleaching action of $S O_{2}$ is temporary in nature as atmospheric oxygen can again oxidize the bleached substance back to its colored form.

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