Systematic name for Fe2O3 (s)

Cul (s) - - > represents its state which means solid, Here Valency of copper is 1 so its cuprous.

Fe2O3--> Ferric Oxide is a solid. Here valency of Fe is + 3 so its Ferric

CoF2--> Cobalt Flouride is a solid

FeO - - > Ferrous Oxide is a solid. Here valency of iron is + 2 so its Ferrous.