Chemistry - Complete d-block Question with Solution | TestHub

The complex compounds formed when KCN solution is added to a solution containing both$\mathrm{C}{\mathrm{u}}^{2+}$and$\mathrm{C}{\mathrm{d}}^{2+}$ions are${\mathrm{K}}_3\left[\mathrm{C}\mathrm{u}\right(\mathrm{C}\mathrm{N}{)}_4],{\mathrm{K}}_2[\mathrm{C}\mathrm{d}\left(\mathrm{C}\mathrm{N}{)}_4\right]$
$\text{1}\text{.}{\text{CuSO}}_{\text{4}}\text{+}\text{2KCN}\to \underset{\text{Cupric}\text{cyanide}}{{\text{Cu(CN)}}_{\text{2}}}\text{+}{\text{K}}_{\text{2}}{\text{SO}}_{\text{4}}$
$\text{2}\text{.}{\text{2Cu(CN)}}_{\text{2}}\to \underset{\text{Cuprous}\text{cyanide}}{{\text{Cu}}_{\text{2}}{\text{(CN)}}_{\text{2}}}\text{+}{\text{(CN)}}_{\text{2}}$
$\text{3}\text{.}{\text{Cu}}_{\text{2}}{\text{(CN)}}_{\text{2}}\text{+}\underset{\text{excess}}{\text{6KCN}}\to \underset{\text{stable}\text{complex}}{{\text{2K}}_{\text{3}}\text{[Cu}\left({\text{CN)}}_{\text{4}}\right]}$