Write IUPAC name of the complex $\left[\mathrm{Pt}{\left(\mathrm{en}\right)}_2{\mathrm{Cl}}_2\right]$. Draw structures of geometrical isomers for this complex.
OR
Using IUPAC norms write the formulae for the following:
(i) Hexaamminecobalt(III) sulphate
(ii) Potassium trioxalatochromate(III)