During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value…

In neutral or weakly alkaline solution oxidation state of $\mathrm{Mn}$ changes by $3$ unit. The reaction between permanganate and thiosulfate is a redox reaction, in which permanganate acts as an oxidizing agent and thiosulfate acts as a reducing agent.

${{\mathrm{MnO}}_4}^{⊝}+{\mathrm{S}}_2{{\mathrm{O}}_3}^{-2}\to {\mathrm{MnO}}_2+{{\mathrm{SO}}_4}^{-2}$

This ionic mechanism is favoured in neutral aqueous medium.