$Cl{O_2} + 2{H_2}O + 5e \to C{l^ - } + 4O{H^ - }$

${H_2}{O_2} \to {O_2}$

${H_2}{O_2} + 2O{H^ - } \to {O_2} + 2{H_2}O + 2e$

$Cl{O_2} + 2{H_2}O + 5e \to C{l^ - } + 4O{H^ - }] \times 2$

${H_2}{O_2} + 2O{H^ - } \to {O_2} + 2{H_2}O + 2e] \times 2$

$2Cl{O_2} + 5{H_2}{O_2} + 2O{H^ - } \to 2C{l^ - } + 5{O_2} + 5{H_2}O$

$2Cl{O_2} \equiv 5{H_2}{O_2}$

$\therefore \,\,\,\,\,\,Cl{O_2} = 2.5{H_2}{O_2}$