Primary and secondary valency of platinum in the complex $\left[\mathrm{Pt}(\mathrm{en}{)}_2{\mathrm{Cl}}_2\right]$ are 

In terms of Werner’s postulates explain the bonding in ${\mathrm{CoCl}}_3.6{\mathrm{NH}}_3$.

Write oxidation state, coordination number and electronic configuration of the metal atom in the following complex.

${\mathrm{K}}_4\left[\mathrm{Mn}{\left(\mathrm{CN}\right)}_6\right]$

Classify the following ligand based on the number of donor atoms.

${\mathrm{NH}}_3$