How will you obtain pure potassium permanganate $(K M n O_{4})$ crystals from its ore, pyrolusite? Give the steps involved and the reactions.

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Solution

$(K M n O_{4})$ Potassium permanganate is prepared from mineral pyrosulphite $(M n O_{2})$
(a) Conversion of Pyrosulphite ore $(M n O_{2})$ to Potassium Magnate $K_{2} M n O_{4}$ :
$M n O_{2} + 4 K O H + O_{2} H e a t - ------ \to 2 K_{2} M n O_{4} + 2 H_{2} O$
(b) Oxidation of Potassium Magnate $(K_{2} M n O_{4})$ to potassium permanganate $(K M n O_{4})$
$2 K_{2} M n O_{4} + {C l}_{2} \to 2 K C l + K M n O_{4}$

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