Question

Which one of the following reactions indicated the reducing ability of hydrogen peroxide in basic medium?

Options

• \[\ce{HOCl + H2O2 -> H2O^+ + Cl^- + O2}\]

• \[\ce{PbS + 4H2O2 -> PbSO4 + 4H2O}\]

• \[\ce{2MnO^-4 + 2H2O2 -> 2MnO2 + 3O2 + 2H2O + 2OH^-}\]

• \[\ce{Mn^{2+} + H2O2 -> Mn^{4+} + 2OH^-}\]

Answer 1

\[\ce{2MnO^-4 + 2H2O2 -> 2MnO2 + 3O2 + 2H2O + 2OH^-}\]

Explanation:

Since the oxidation state of Mn changes from +7 to +4. So, Mn gets reduced.

Therefore, H₂O₂ is acting as a reducing agent in the above reaction.