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How is potassium permanganate (KMnO(4)) ...

How is potassium permanganate `(KMnO_(4))` prepared from `MnO_(2)` ? Write the equations.

Text Solution

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By fusion of `MnO_(2)` with an alkali metal hydroxide and an oxidizing agent `KNO_(3)` gives `K_(2)MnO_(4)` which on acidification gives permanganate.
`2MnO_(2)+4KOH+O_(2)rarr 2K_(2)MnO_(4)+2H_(2)O`
`3MnO_(2)^(-2) + 4H^(+)rarr2MnO_(4)^(-)+MnO_(2)+2H_(2)O`
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