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 ? :-
$\mathrm{MnO}_{4}^{-}$
$\mathrm{SO}_{3}^{2-}$
KI
$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$
Correct Option: 1
Solution:
