$$\begin{gathered} \mathrm{I}) {\mathrm{H}}_2{\mathrm{O}}_2+{\mathrm{Cl}}_2\to 2\mathrm{HCl}+{\mathrm{O}}_2; \\ \mathrm{II}){\mathrm{H}}_2{\mathrm{O}}_2+2\mathrm{NaOH}\to 2{\mathrm{Na}}_2{\mathrm{O}}_2+2{\mathrm{H}}_2\mathrm{O}; \\ \mathrm{Role} \mathrm{of} {\mathrm{H}}_2{\mathrm{O}}_2 \mathrm{in} \mathrm{the} \mathrm{above} \mathrm{reactions} \mathrm{is} \end{gathered}$$

 Reducing agent in (I) and oxidizing agent in (II)       

 Oxidizing in (I) and acid in (II) 

Reducing agent in (I) and acid in  (II)     

 Oxidizing agent in (I) and reducing agent in (II)