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How potassium permanganate is prepared f...

How potassium permanganate is prepared from `MnO_2. `

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(a) Preparation of `KMnO_4`: Potassium permanganate is prepaered by the fusion of `MnO_2` with an alkali metal hydroxidizing like `KNO_3` . It froms dark green `K_2 MnO_4` which disproportinates in a neutral of acidic solution to give peremanganate
(i) `3MnO_2 + 4KOH + O_2 overset ( KNO_3) to 2K_2 MnO_4 + 2H_2O`
(ii) `3MnO_(4)^(2-) + 4H to 2MnO_4+ MnO_2 + 2H_2O`
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