Classical Idea Of Redox Reactions Oxidation And Reduction Reactions

Step 1: Iron commonly exhibits oxidation states of and , as seen in compounds such as FeO and Fe O .
Step 2: Iron can also exhibit oxidation states of and in compounds such as FeO and ferrates (FeO ).
Step 3: However, iron does not commonly exhibit the oxidation state, as no stable compounds with Fe are known.
Step 4: Therefore, the correct answer is (D).