JEE Main · 2022 · 29 Jul 2022 · Shift 1 · d and f Block Elements

In neutral or faintly alkaline medium,

KMnO_{4}

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✓ Correct

Answer: (D)

Solution

In neutral or faintly alkaline medium,

KMnO_{4}

(where Mn is in +7 oxidation state) is reduced to

MnO_{2}

(where Mn is in +4 oxidation state). The change in oxidation state of manganese is

+ 7 \to + 4

, which is a decrease of 3.

JEE Main · 2022 · 29 Jul 2022 · Shift 1 · Single correct option

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