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Q.

$M n O_{4}^{2 -}$ is quite strongly oxidizing and is stable only in very strong alkali. In acidic solution it disproportionate as
$a M n O_{4}^{2 -} + H^{+} \to______+ M n O_{2} + H_{2} O$
Find the value of ‘a’ in the above balanced reaction:

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answer is 3.

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Detailed Solution

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$3 M n O_{4}^{2 -} + 4 H^{+} \to 2 M n O_{4}^{-} + M n O_{2} + 2 H_{2} O$

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