Hydrogen peroxide acts both as an oxidising and as a reducing agent...

Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases

\mathrm{H}_2 \mathrm{O}_2

acts as a reducing agent in acid medium?

Options

A $\mathrm{MnO}_4^{-}$
B $\mathrm{Cr}_2 \mathrm{O}_7^{2-}$
C $\mathrm{SO}_3^{2-}$
DKI

Correct answer

A. $\mathrm{MnO}_4^{-}$

Step-by-step solution

\mathrm{H}_2 \mathrm{O}_2

acts as a reducing agent only in presence of strong oxidising agents (i.e., \left.\mathrm{MnO}_4^{-}\right)

in acidic as well as alkaline medium.

\begin{aligned}&2 \mathrm{KMnO}_{4}+3 \mathrm{H}_{2} \mathrm{SO}_{4}+5 \mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow \\ &\mathrm{K}_{2} \mathrm{SO}_{4}+2 \mathrm{MnSO}_{4}+8 \mathrm{H}_{2} \mathrm{O}+5 \mathrm{O}_{2} \end{aligned}

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