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K₂MnO₄ is unstable in acidic solution and the green solution obtained is changed into purple colouration. Correct statements regarding the above changes are:

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it is disproportionation reaction

It produces black precipitate of $M n O_{2}$

it produces red ppt. of hydrated MnO₂

it produces KMnO₄

answer is A, B, C.

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Detailed Solution

$\overset{+ 6}{3 K_{2} M n O_{4}} + 2 H_{2} O \underset{}{⇌} {2 K M n O_{4}}_{p u r p l e}^{+ 7} + \overset{}{\underset{(d a r k b r o w n o r b l a c k)}{M n O_{2}}} + + 4 K O H$

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