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
(1) aqueous neutral
(2) aqueous acidlic
(3) both aqueous acidic and neutral
(4) both aqueous acidic and faintly alkaline

Answer: Option 1
When potassium permanganate (KMnO4) reacts with sodium thiosulfate (Na2S2O3) in an aqueous neutral medium, the following reaction occurs:
H2O + 8 MnO4– + 3 S2O32- → 8 MnO2 + 6 SO42- + 2 OH
In this reaction, the oxidation state of manganese (Mn) changes from +7 in permanganate (MnO4-) to +4 in manganese ions (Mn2+) of MnO2.
The reaction involves the reduction of MnO4- to Mn2+ and the oxidation of S2O32- to SO42-. The presence of an aqueous neutral medium favors the reduction-oxidation (redox) reaction between KMnO4 and Na2S2O3, leading to the change in oxidation state of manganese.

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