Question

Write the coordination number and oxidation state of Platinum in the complex $\left[Pt\right(en{)}_{2}C{l}_2]$.

Answer 1

The coordination number of Platinum in the complex $\left[Pt\right(en{)}_{2}C{l}_2]$ is 6. Platinum atom is surrounded by six donor atoms. Chlorine is monodentate ligand with one donor atom. Ethylene diamine (en, $H_{2}N-C{H}_2-C{H}_2-N{H}_2$) is bidentate ligand with 2 donor N atoms.
Let x be the oxidation state of Platinum in the complex $\left[Pt\right(en{)}_{2}C{l}_2]$. The oxidation states of Cl and en are $0$ and $-1$ respectively.

$x+2\left(0\right)+2(-1)=0$

$x-2=0$

$x=+2$
The oxidation state of Platinum in the complex $\left[Pt\right(en{)}_{2}C{l}_2]$ is $+2$.