Question

The oxidation and coordination number of $Pt$ in ${\left[Pt\left(C_2{H}_4\right){\left(Cl\right)}_3\right]}^{-}$ is respectively :-

• A. $+1,3$
• B. $+2,4$
• C. $+3,6$
• D. $+2,5$

Answer 1

Answer: (B)

According to the question, the total number of ligands attached to a central metal ion is known as the coordination number of that ion. Or in the other words, the coordination number is the number of ligands in the coordination sphere of a complex compound.
Here, in this given compound, one ethylene and three chloride ions present in the coordination sphere so, the coordination number of complex are four.
Here, ethylene is neutral ligand and chloride is uni-negative ion, so
$x-0+3(-1)=-1x=+2$
So, the oxidation number and coordination number of the complex are $=$ $+2\&4$ .