(a)Describe the preparation of potassium permanganate.

(b)How does the acidified permanganate solution react with

(i) iron (ii) ions (ii) $S O_{2}$ ?

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Solution

Preparation of $K M n O_{4}$

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

$K_{2} M n O_{4}$ disproportionates in a neutral or acidic solution to give permanganate.

$M n O_{4}^{2 -} Electrolytic oxidation - ------------ \to in alkaline solution M n O_{4}^{-}$

(a) $5 F e^{+ 2} + M n O_{4}^{-} + 8 H^{+} \to M n^{2 +} + 4 H_{2} O + 5 F e^{+ 3}$

(b) $5 S O_{2} + M n O_{4}^{-} + 2 H_{2} O 1 + p - - \to 2 M n S O_{4} + 2 K H S O_{4} + H_{2} S O_{4}$

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(a)Describe the preparation of potassium permanganate. (b)How does the acidified permanganate solution react with (i) iron (ii) ions (ii) SO2?

(a)Describe the preparation of potassium permanganate.

(b)How does the acidified permanganate solution react with

(i) iron (ii) ions (ii) $S O_{2}$ ?