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.

In permanganate (MnO₄⁻), manganese has an oxidation state of +7.

If the change in oxidation state is 3, then Mn goes from +7 to +4, forming MnO₂.

The behavior of permanganate depends on the medium:

- In acidic medium: Mn goes from +7 to +2 (change of 5), forming Mn²⁺

- In neutral/weakly alkaline medium: Mn goes from +7 to +4 (change of 3), forming MnO₂

- In strongly alkaline medium: Mn goes from +7 to +6 (change of 1), forming MnO₄²⁻

Since the change in oxidation state is 3 (from +7 to +4), the reaction occurs in aqueous neutral medium.

The correct answer is Aqueous neutral.