Question

In the complex $K_{2}Fe\left[Fe\right(CN{)}_6]:$

• A. Both $Fe$ atoms are in the same oxidation state
• B. Both $Fe$ atoms are in different oxidation state
• C. The coordination number of iron is $4$
• D. The complex is a high spin complex

Answer 1

The correct option is A Both $Fe$ atoms are in the same oxidation state

In the complex, $K_{2}Fe\left[Fe\right(CN{)}_6]:$
Let, the oxidation state of $Fe$ be $x$
Therefore,
$1\times 2+2x-1\times 6=0\Rightarrow 2+2x-6=0\Rightarrow 2x=4\Rightarrow x=+2$
So, both $Fe$ atoms are in same oxidation state $(+2)$.
Coordination number of iron is $6$.
In complex, hybridisation of central atom is $d^{2}s{p}^3$ as $C{N}^{-}$ is a strong field ligand. So, it is a low spin complex.