Question

The coordination of Pt in the complex ion $\left[Pt\right(en{)}_{2}C{l}_2{]}^{2+}$ is

Answer 1

The coordination of Pt in the complex ion $\left[Pt\right(en{)}_{2}C{l}_2{]}^{2+}$ is 6.
$en$ (ethylene diamine) is bidentate and $2C{l}^{-}$ monodentate ligands.
So, 2 $en$ ligand and $2C{l}^{-}$ ligand corresponds to six donor atoms. Thus coordination number of complex is 6.