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In neutral or faintly alkaline medium, KMnO4 being a powerful oxidant can oxidize,

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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 :

(A) 5 

(B) 1 

(C) 0 

(D) 3

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Correct option is (D) 3

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

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