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  4. The correct charge on and co-ordination number of ‘Fe’ in K3 [ Fe (CN)6] is

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Q. The correct charge on and co-ordination number of $‘Fe’$ in $K_3 [ Fe (CN)_6]$ is

MHT CETMHT CET 2017Coordination Compounds

Solution:

The correct charge on and co-ordination number of $Fe$ in $K _{3}\left[ Fe ( CN )_{6}\right]$ is $+3$ and $6$ respectively.
Since Fe atom is surrounded by six cyanide ligands, the co-ordination number is $6 .$
The charge on potassium ion is $+1$ and the charge on cyanide ligand is $-1$.
Let $X$ be the charge on $Fe$.
$3(+1)+X+6(-1)=0$
$3+X-6=0$
$X-3=0$
$X=+3$