Question: what is the difference between iron ii and iron iii?
Answer: Ferric means the iron(III) ion Fe+3, and ferrous means iron(II), which is Fe+2. Both of these ions react with oxygen, but ferric oxide is more common. Ferric oxide is Fe2 O3, and ferrous oxide is FeO. Ferrous oxide is reddish in color and is known as the mineral hematite.