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Common Oxidation States

MnO 2 when fu...

Question

$M n O_{2}$ when fused with KOH and oxidized in air gives a dark green compound X. In acidic X. In acidic solution, X undergoes disproportion to give an intense purple compound Y and $M n O_{2}$ . The compounds X and Y respectively, are

A

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B

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C

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D

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Solution

The correct option is A

$2 M n O_{2} + 4 K O H + O_{2} \to 2 K_{2} M n O_{4} + 2 H_{2} O 3 K_{2} M n O_{4} + 4 H C l \to 2 K M n O_{4} (p u r p l e) + M n O_{2} + 4 K C l + 2 H_{2} O$

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