Choose the correct option regarding change in oxidation number of the underlined atom in the following conversion.
$M n - -- - O_{4}^{-} + 3 O H^{-} \to M n O_{2} + H_{2} O$

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Solution

In the transformation, $M n - -- - O_{4}^{-} + 3 O H^{-} \to M n O_{2} + H_{2} O$ , the oxidation number of $M n$ changes from $+ 7$ to $+ 4$ .
Hence, the change in the oxidation number of $M n$ is $3$ .

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