In which of the following reactions, hydrogen peroxide acts as an oxidizing agent?

$\displaystyle \mathrm{HOCl}+\mathrm{H}_2 \mathrm{O}_2 \rightarrow \mathrm{H}_3 \mathrm{O}^{+}+\mathrm{Cl}^{-}+\mathrm{O}_2$

$\displaystyle \mathrm{I}_2+\mathrm{H}_2 \mathrm{O}_2+2 \mathrm{OH}^{-} \rightarrow 2 \mathrm{I}^{-}+2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2$

$\displaystyle \begin{aligned} & 2 \mathrm{MnO}_4^{-}+3 \mathrm{H}_2 \mathrm{O}_2 \rightarrow 2 \mathrm{MnO}_2+3 \mathrm{O}_2+ \\ & 2 \mathrm{H}_2 \mathrm{O}+2 \mathrm{OH}^{-} \end{aligned}$

$\displaystyle \mathrm{PbS}+4 \mathrm{H}_2 \mathrm{O}_2 \rightarrow \mathrm{PbSO}_4+4 \mathrm{H}_2 \mathrm{O}$