In neutral or faintly alkaline medium,KMnO4 being a powerful oxidant can oxidize, thiosulphate almostquantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be

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In neutral or faintly alkaline medium, $K M n O_{4}$ being a powerful oxidant can oxidize, thiosulphate almost
quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be

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answer is D.

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Detailed Solution

$8 \overset{+ 7}{M} n O_{4}^{-} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to 8 \overset{+ 4}{M} n O_{2} + 6 S O_{4}^{2 -} + 2 O H^{-}$

Change in oxidation state of Mn is from +7 to +4 which is 3.

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