JEE MAIN - Chemistry (2023 - 6th April Evening Shift - No. 9)
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.
aqueous neutral
both aqueous acidic and faintly alkaline
both aqueous acidic and neutral
aqueous acidic
Explanation
In a neutral or weakly alkaline solution, permanganate ions are reduced to MnO₂, with a change in oxidation state from +7 to +4, which is a change of 3 units.
The balanced redox reaction is :
3MnO₄⁻ + 5S₂O₃²⁻ + 2H₂O → 3MnO₂ + 5SO₄²⁻ + 10OH⁻
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