Question

The oxidation number of fe in k3[fe(cn)5no] is

Answer 1

Neutralise the charge on whole compound.

+3 +x -5 +0 = 0

x = +2

Answer 2

The oxidation number of iron in the complex is +2

Explanation:

A coordination complex contains ligands that are bonded to the central metal atom or ion to form coordinate covalent bond. The ligands and the central metal together form the coordination sphere.

The given coordination complex is: $K_3[Fe(CN)_5NO]$

Central metal atom is Iron (Fe)

Coordination sphere consists of 1 neutral nitrosyl ligand and 5 cyanide ligands that carry -1 charge and as potassium carries a +1 charge each. As, there are 3 potassium ions. So, the coordination sphere will carry -3 charge as the the coordination compound is electrically neutral.

Let the oxidation state of Fe be 'x'

Oxidation state of $CN^-$ ligand = -1

Oxidation state of NO ligand = 0

Evaluating the oxidation state of iron, we get:

$\Rightarrow x+5(-1)+0=-3\\\\\Rightarrow x=+2$

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