(i) Draw the geometrical isomers of complex [ $\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_2{\mathrm{Cl}}_2$ ].
(ii) On the basis of crystal field theory, write the electronic configuration for ${\mathit{d}}^4$ ion if .
(iii) Write the hybridization and magnetic behaviour of the complex $\left[\mathrm{Ni}{\left(\mathrm{CO}\right)}_4\right]$.
(At.no. of $\mathrm{Ni}=28$ )