\( \mathrm{K}_{2} \mathrm{MnO}_{4} \) is unstable in aqueous solution and the green solution obt...

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\( \mathrm{K}_{2} \mathrm{MnO}_{4} \) is unstable in aqueous solution and the green solution obtained is changed into purple colouration incorrect statement regarding the above change is
(1) It is a disproportionation reaction
(2) It produces \( \mathrm{KMnO}_{4} \)
(3) It produces black precipitate of hydrated \( \mathrm{MnO}_{2} \)
(4) \( \mathrm{K}_{2} \mathrm{MnO}_{4} \) is stable in acidic medium
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