# In which of the following $H_2O_2$ acts as reducing agent?

$\begin{array}{1 1}(a)\;PbS+H_2O_2\rightarrow PbSO_4+4H_2O\\(b)\;Na_2SO_3+H_2O_2\rightarrow Na_2SO_4+H_2O\\(c)\;Ag_2O+H_2O_2\rightarrow 2Ag+H_2O+O_2\\(d)\;NaNO_2+H_2O_2\rightarrow NaNO_3+H_2O\end{array}$

$Ag_2O$ is reduced to Ag.Put this reaction in (c) option.
$Ag_2O+H_2O_2\rightarrow 2Ag+H_2O+O_2$
So,$Ag_2O$ is oxidizing agent and $H_2O_2$ is reducing agent.
Hence (c) is the correct option.