Question

Oxidation state of Fe in (Fe[CO]5) is?

Answer 1

Answer: zero

Explanation: The oxidation state of Fe in $(Fe(CO)_5)$ is zero as the ligands attached to iron is carbonyl  $CO$ which is a neutral ligand which carries no charge.

The oxidation state of Fe is $(Fe(CO)_5)$

Let the oxidation state of Fe be 'x'

, the overall charge is zero.

Thus $x+5(0)=0$

$x=0$