Which of the following compound acts both as an oxidising as well as reducing agent?

S O_{2}

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M n O_{2}

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A l_{2} O_{3}

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C r O_{3}

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Solution

The correct option is A $S O_{2}$
The minimum and maximum oxidation number of $S$ are $- 2$ and $+ 6$ respectively. Since the oxidation number of $S$ in $S O_{2}$ is $+ 4$ , therefore it can be either increased or decreased. Therefore $S O_{2}$ behave both as an oxidising as well as reducing agent.

$S O_{2}$ acts both as an oxidising as well as reducing agent.

As an oxidizing agent.

$2 F e C l_{3} + S O_{2} + 2 H_{2} O \to 2 F e C l_{2} + H_{2} S O_{4} + 2 H C l$

As a reducing agent

$I_{2} + S O_{2} + 2 H_{2} O \to 2 H I + H_{2} S O_{4}$

So, the correct option is $A$

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4 H C l + M n O_{2} \to M n C l_{2} + 2 H_{2} O + C l_{2}

The compound which could not act both as oxidising as well as reducing agent is

{S O}_{2}

Which one acts as both oxidising as well as reducing agent?

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