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Potassium Permanganate

Pyrolusite is...

Question

Pyrolusite is MnO $_{2}$ and is used to prepare KMnO $_{4}$ . The steps followed to convert $M n O_{2}$ to $M n O_{4}^{-}$ are:
$M n O_{2} I \to M n O_{4}^{2 -} I I - \to M n O_{4}^{-}$
Steps I and II, respectively, are

fuse with KOH/ air and electrolytic oxidation

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fuse with KOH/ KNO

_{3}

and electrolytic oxidation

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fuse with conc. HNO

_{3}

air and electrolytic reduction

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dissolve in H

_{2}

O and oxidation

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Solution

The correct options are
A fuse with KOH/ air and electrolytic oxidation
C fuse with KOH/ KNO $_{3}$ and electrolytic oxidation
The process followed to convert $M N O_{2}$ to $M n O_{4}^{-}$ are as follows: MnO $_{2}$ is fused with KOH in presence of air or oxidising agents like KNO $_{3}$ , KClO $_{3}$ etc.
$2 M n O_{2} + 4 K O H + O_{2} f u s e - - \to 2 K_{2} M n O_{4} + 2 H_{2} O$
$M n O_{4}^{2 -} e l e c t r o l y t i c o x i d a t i o n - ------------ \to M n O_{4}^{-} + e^{-}$ .

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