Sol. $$ \begin{aligned} & \mathrm{CrO}_3=\text { Acidic } \\ & \mathrm{Mn} 2 \mathrm{O} 7=\text { Acidic } \\ & \therefore \mathrm{x}=2 \\ & {\left[\mathrm{Cl}_{\mathrm{O}}^{\prime \prime \prime}\left(\mathrm{H}_2 \mathrm{NCH}_2 \mathrm{CH}_2 \mathrm{NH}_2\right)_3\right]_2\left(\mathrm{SO}_4\right)_3 \rightleftharpoons} \\ & 2\left[\mathrm{Co}_{\mathrm{O}}^{\prime \prime \prime}\left(\mathrm{H}_2 \mathrm{NCH}_2 \mathrm{CH}_2 \mathrm{NH}_2\right)_3\right]^{3+}+3 \mathrm{SO}_4^{2-} \\ & \therefore \text { Primary valency }=3 \\ & \therefore \mathrm{x}+\mathrm{y}=5 \end{aligned} $$