Preparation of potassium permanganate from involves a two-step process in which the first step is a reaction with and to produce [2025]

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Solution

Q.
Preparation of potassium permanganate from ${MnO}_{2}$ involves a two-step process in which the first step is a reaction with $KOH$ and ${KNO}_{3}$ to produce [2025]

1 $K_{2} {MnO}_{4}$

2 $K_{3} {MnO}_{4}$

3 ${KMnO}_{4}$

4 $K_{4} [Mn {(OH)}_{6}]$

Ans.
(1)

Potassium permanganate is prepared by fusion of ${MnO}_{2}$ (pyrolusite) with an alkali metal hydroxide and an oxidising agent. This produces the dark green $K_{2} {MnO}_{4}$ , which disproportionates in a neutral or acidic solution to give permanganate.

${MnO}_{2} + 2 KOH + {KNO}_{3} \to K_{2} {MnO}_{4} + {KNO}_{2} + H_{2} O$

$3 {MnO}_{4}^{2 -} + 4 H^{+} \to 2 {MnO}_{4}^{-} + {MnO}_{2} + 2 H_{2} O$

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