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MnO(2) overset(I)(to)MnO(4)^(2-)overset(...

`MnO_(2) overset(I)(to)MnO_(4)^(2-)overset(II)(to)MnO_(4)^(-)` I and II are

A

Fusion with `KOH`/air , electrolytic oxidation

B

Fusion with `KOH//KNO_(3)` , disproportion in a neutral solution

C

Fusion with `HNO_(3)`/air , electrolytic reduction

D

Both 1 & 2

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