Which of the following acts as both reducing and oxidising agents?

H_{2} S O_{4}

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H N O_{3}

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H_{2} O_{2}

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K M n O_{4}

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Solution

The correct option is B $H_{2} O_{2}$
In (A), (B) and (D); sulphur, nitrogen and $M n$ are in their maximum oxidation state, so can only able to reduce, thus only act as oxidising agent.
(C) Only $H_{2} O_{2}$ will act as both.
(i) In case of oxidising agent
$H_{2} O_{2}$ itself get reduced:
e.g: $_{2}_{2} \to - 2 O (H_{2} O)$
(ii) In case of reducing agent $H_{2} O_{2}$ itself get oxidise
$H_{2}_{2} \to O_{2}$ .

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