Question

In which of the following compounds, the oxidation state of transition metal is zero?

• A. $Cr{O}_5$
• B. ${Fe}_3{O}_4$
• C. $FeS{O}_4$
• D. $Fe{\left(CO\right)}_5$

Answer 1

The correct option is D $Fe{\left(CO\right)}_5$

In $Fe{\left(CO\right)}_5$, the oxidation state of transition metal is zero.
(A) In $Cr{O}_5$, the oxidation state of metal is +6.
(B) In ${Fe}_3{O}_4$, the oxidation state of metal is $\frac{8}{3}$.
(C) In $FeS{O}_4$, the oxidation state of metal is +2.
(D) In $Fe{\left(CO\right)}_5$, the oxidation state of metal is zero.