Aqueous solution of \( \mathrm{SO}_{2} \) reacts with \( \mathrm{H}_{2} \mathrm{~S} \) to precip...

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Aqueous solution of \( \mathrm{SO}_{2} \) reacts with \( \mathrm{H}_{2} \mathrm{~S} \) to precipitate sulphur. Here \( \mathrm{SO}_{2} \) acts as:
(A) catalyst
(B) oxidising agent
(C) reducing agent
(D) acid.
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