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

Question:

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 ?

  1. $\mathrm{MnO}_{4}^{-}$

  2. $\mathrm{SO}_{3}^{2-}$

  3. KI

  4. $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$

Correct Option: 1

Solution:

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