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  4. Which compound acts as an oxidising as well as reducing agent?

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Q. Which compound acts as an oxidising as well as reducing agent?

The p-Block Elements - Part2

Solution:

The minimum and maximum oxidation number of $S$ are $-2$ and $+6$ respectively. Since the oxidation number of $S$ in $SO_2$ is $+4$, therefore it can be either increased or decreased. Therefore behaves both as an oxidising and as reducing agent.