$K_{2} M n O_{4}$ in acidic or neutral medium undergo disproportionation reaction to give

M n O_{4}^{-}

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M n O_{2}

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M n O_{4}^{2 -}

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M n_{2} O_{4}^{2 -}

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Solution

The correct option is B $M n O_{2}$
Disproportionation reaction of managanate in acidic or neutral medium is one of the preparation method for the permanaganate.

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

Here, $M n^{6 +}$ is disproportionate to $M n^{7 +}$ and $M n^{4 +}$

Hence, option (a) and (b) are correct.

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K2MnO4 in acidic or neutral medium undergo disproportionation reaction to give

The correct option is B MnO2Disproportionation reaction of managanate in acidic or neutral medium is one of the preparation method for the permanaganate. 3MnO2−4+4H+→2MnO−4Dark purple+MnO2+2H2O Here, Mn6+ is disproportionate to Mn7+ and Mn4+ Hence, option (a) and (b) are correct.

$K_{2} M n O_{4}$ in acidic or neutral medium undergo disproportionation reaction to give