# Why is it important to specify the oxidation state of the iron oxide in a specific problem?

All of the given oxides are known; rust chemistry is a very broad church, and $F {e}_{3} {O}_{4}$ is a mixed oxidation state oxide, i.e. $F e O \cdot F {e}_{2} {O}_{3}$, i.e. $\stackrel{+ I I}{\text{Fe/"stackrel(+III)"Fe}}$.