JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Redox Reactions and Electrochemistry

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During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction.

(A)aqueous acidic
(B)aqueous neutral✓ Correct
(C)both aqueous acidic and neutral
(D)both aqueous acidic and faintly alkaline.

Answer: (B)

Solution

In neutral or weakly alkaline medium, permanganate (

MnO_{4}^{-}

) is reduced to manganese dioxide (

MnO_{2}

), where the oxidation state of Mn changes from +7 to +4, a change of 3 units. In acidic medium,

MnO_{4}^{-}

is reduced to

Mn^{2 +}

(change of 5 units). Therefore, the neutral medium favours the reaction with a change of 3 in oxidation state.

JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Single correct option

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