Write the preparation of potassium permanganate and how the acidified permanganate solution re-acts with oxalic acid ?

2 M n O_{4}^{-} + 16 H^{+} + 5 C_{2} O_{4}^{2 -} \to 2 M n^{2 +} + 8 H_{2} O + 10 C O_{2}

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3 M n O_{4}^{-} + 16 H^{+} + 7 C_{2} O_{4}^{2 -} \to 3 M n^{2 +} + 8 H_{2} O + 14 C O_{2}

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3 M n O_{4}^{-} + 14 H^{+} + 5 C_{2} O_{4}^{2 -} \to 3 M n^{2 +} + 7 H_{2} O + 10 C O_{2}

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None of these

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Solution

The correct option is A $2 M n O_{4}^{-} + 16 H^{+} + 5 C_{2} O_{4}^{2 -} \to 2 M n^{2 +} + 8 H_{2} O + 10 C O_{2}$
Option (A) is correct.
Commercially potassium permanganate is prepared by the alkaline oxidative fusion of Pyrolusite ore $(M n O_{2})$ followed by the electrolytic oxidation of manganate ion.

$2 M n O_{2} + 4 K O H + O_{2} ⟶ 2 K_{2} M n O_{4} + 2 H_{2} O$

$M n O_{4}^{2 -} (e l e c t r o l y t i c o x i d a t i o n) ⟶ M n O_{4}^{-} + e^{-}$

Reaction of acidified permanganate solution with oxalic acid :

$2 M n O_{4}^{-} + 16 H^{+} + 5 C_{2} O_{4}^{2 -} \to 2 M n^{2 +} + 8 H_{2} O + 10 C O_{2}$

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