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Q.

In neutral or faintly alkaline medium,KMnO4 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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a

1

b

0

c

3

d

5

answer is D.

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Detailed Solution

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8M+7nO4−+3S2O32−+H2O→8M+4nO2+6SO42−+2OH−

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

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