Question

What is Oxidation number of fe in fe (co)5?

Answer 1

Let Fe be X,

then
As CO has 0 oxidation state,

X + 0(5) = 0

Therefore oxidation state of Fe in Fe(co)5 is 0.

Hope you get your answer.

Answer 2

$\mathrm{Fe}(\mathrm{CO})_{5}$ is known as Pentacarbonyl iron.

CO or Carbonyl ligand is neutral in nature. So its charge is zero. Therefore, the central metal atom which is Iron (Fe) in this case will also have an oxidation state of zero.

This compound is an oily liquid with a certain yellow hue. It is used to manufacture carbonyl iron which is in return used to produce powdered iron on an industrial scale.