How is potassium permanganate ( KMnO4) p...

How is potassium permanganate `( KMnO_4)` prepared from `MnO_2` ? write the equation.

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`KMnO_4` is prepared from pyrolusite `(MnO_2)`.
Step-I : Pyrolusite is powdered and fused with KOH in presence of `KNO_3` as an oxidizing agent to from potassium manganate.
`2MnO_2 + 4KOH + O_2 to 2K_2MnO_44 + 2H_2O`
Step II : The potassium manganate undergoes disproportionation in acidic or neutral medium to give permanganate.
`3MnO_(4)^(2-) + 4H^(+) to 3MnO_(4)^(-) + MnO_(2) + 2H_2O`.
The purple solution so obtained is concentrated to get dark purple crystals of `KMnO_4`

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How is potassium permanganate `( KMnO_4)` prepared from `MnO_2` ? write the equation.

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