Hydrogen peroxide acts both as an oxidising and as a reducing agent, depending upon the nature of the reacting species. In which of the following cases $H_{2} O_{2}$ acts as a reducing agent in acid medium?

M n O_{4}^{-}

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C r_{2} O_{7}^{2 -}

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S O_{3}^{2 -}

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K I

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Solution

The correct option is A $M n O_{4}^{-}$
The oxidation state of $M n$ in $M n O_{4}^{-}$ is $+ 7$ . $H_{2} O_{2}$ can only reduce $M n$ as it is in maximum oxidation state in $M n O_{4}^{-}$ .

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