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Q.

K2MnO4 is unstable in pure water of acidic solution and green colour of solution changes
to purple after some time. This change is accompanied by

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a

disproportionation of K2MnO4

b

decrease in pH of solution

c

precipitation of MnO2

d

formation of KMnO4 in solution

answer is A, C, D.

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Detailed Solution

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3K2MnO4+2H2O⇌2KMnO4 (purple) +MnO2↓+4KOH (brown) 

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