Pyrolusite is MnO 2 used to prepare KMnO 4- Steps are- MnO2 MnO42- MnO4-Steps I and II are -

The correct options are A fuse with KOH / air and electrolytic oxidation. B fuse with KOH / KNO _3 #160; and electrolytic oxidationProcess is:MnO _2 ...

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Byju's Answer

Standard XII

Chemistry

Potassium Permanganate

Pyrolusite is...

Question

Pyrolusite is MnO $_{2}$ used to prepare KMnO $_{4}$ . Steps are, $M n O_{2} I \to M n O_{4}^{2 -} I I - \to M n O_{4}^{-}$ .
Steps I and II 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.
B fuse with KOH / KNO $_{3}$ and electrolytic oxidation
Process is:
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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Pyrolusite is MnO2 used to prepare KMnO4. Steps are, MnO2I→MnO2−4II−→MnO−4.Steps I and II are :

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