In which of the following reactions does hydrogen peroxide act as a reducing agent?

  • A
    $PbS + 4H_2O_2 \rightarrow PbSO_4 + 4H_2O$
  • B
    $2Fe^{2+} + H_2O_2 \rightarrow 2Fe^{3+} + 2OH^{-}$
  • C
    $HOCl + H_2O_2 \rightarrow H_3O^{+} + Cl^{-} + O_2$
  • D
    $Mn^{2+} + H_2O_2 \rightarrow Mn^{4+} + 2OH^{-}$

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