In which of the following reactions $ H_2O_2$ acts as oxidizing agent?

Question

(1) $CI_2+H_2O_2 \rightarrow 2HCI+O_2$

(2) $Ag_2O+H_2O_2 \rightarrow 2Ag + H_2O+O_2$

moist,

(3) $ 2NaOH +H_2O_2 \rightarrow Na_2O_2+2H_2O$

(4) $ KNO_2 + H_2O_2 \rightarrow KNO_3+H_2O$