In which of the following reactions the hydrogen peroxide acts as a reducing agent?
(1) $PbS+4 H_2 O_2 \to PbSO_4+4 H_2 O$
(2) $2 Fe^{2+}+H_2 O_2 \to 2 Fe^{3+}+2 OH^{-}$
(3) $HOCl+H_2 O_2 \to H_3 O^{+}+Cl^{-}+O_2$
(4) $Mn^{2+}+H_2 O_2 \to Mn^{4+}+2 OH^{-}$
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