Question

Which of the following compounds has same oxidation state of the central metal atom in the cationic and anionic part?

• A. $\left[Pt\right(N{H}_3{)}_4\left]\right[PtC{l}_6]$
• B. $\left[Pt\right(py{)}_4\left]\right[PtC{l}_4]$
• C. $\left[Pt\right(N{H}_3{)}_{4}C{l}_2\left]\right[PtC{l}_4]$
• D. $K_4\left[Ni\right(CN{)}_6]$

Answer 1

The correct option is B $\left[Pt\right(py{)}_4\left]\right[PtC{l}_4]$

$\left[Pt\right(py{)}_4\left]\right[PtC{l}_4]$ has the same oxidation state of the central metal atom in the cationic and anionic part.
The oxidation state of $Pt$ in both complex ions is $+2$.
The compound contains $\left[Pt\right(py{)}_4{]}^{2+}$ cation and $[PtC{l}_4{]}^{2-}$ anion.
In $\left[Pt\right(N{H}_3{)}_4\left]\right[PtC{l}_6]$, the $Pt$ atom has oxidation states of $+2$ and $+4$ in the complex cation and complex anion respectively.
In $\left[Pt\right(N{H}_3{)}_{4}C{l}_2\left]\right[PtC{l}_4]$, the $Pt$ atom has oxidation states of $+4$ and $+2$ in the complex cation and complex anion respectively.
In $K_4\left[Ni\right(CN{)}_6]$, the $Ni$ atom has oxidation states of $+2$.