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Q.

Sulphur dioxide is a strong reducing agent. However, it can also act as an oxidizing agent. Which of the following reactions shows its oxidizing nature?

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a

Beaching flower petals

b

Decolorizing of acidified KMnO4 solution

c

Reaction with H2S to give Sulphur

d

turning acidified dichromate paper green

answer is C.

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Detailed Solution

 +4SO2+2H2S−2→2S0+2H2O

Oxidising substance
Here, SO2 decreases the amount of sulphur in H2S from 2 to 0.

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