In the laboratory, manganese (II) salt is oxidised to permanganate ion in aqueous solution by

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Solution

In laboratory, manganese (II) ion salt is oxidised to permangnate ion in aqueous solution by peroxydisulphate.

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

Thus, option (c) is correct.

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