Chemistry - Complete d-block Question with Solution | TestHub

$2{\mathrm{CuSO}}_4+4\mathrm{KCN}\to (\mathrm{CN}{)}_2+2\mathrm{CuCN}+2{\mathrm{K}}_2{\mathrm{SO}}_4$ On combining solution of copper (II) salts and cyanides, an unstable copper (III) cyanide is formed which rapidly decomposes into copper (I) cyanide and cyanogen.