Question

Which of the following compounds exhibits zero oxidation state of iron?

• A. FeSO₄(NH₄)₂SO₄.6H₂O
• B. K₄Fe(CN)₆
• C. Fe(CO)₅
• D. Fe₂O

Answer 1

Answer: (C)

Fe(CO)₅

Answer 2

In $\text{Fe(CO)}_5$, each CO is a neutral ligand. Hence, the oxidation state of iron is 0.