Cerium exhibits three oxidation states, +2, +3 and +4. The +2 state is rare and is observed in CeH2, CeI2 and CeS.[5] The most common compound of cerium is cerium(IV) oxide (CeO2).\\ yes it can be used Ce^3+ (aq) + VO2^+ ------- Ce (s) + VO3 E^o =-4.68 Solution Cerium exhibits three oxidation states, +2, +3 and +4. The +2 state is rare and is observed in CeH2, CeI2 and CeS.[5] The most common compound of cerium is cerium(IV) oxide (CeO2).\\ yes it can be used Ce^3+ (aq) + VO2^+ ------- Ce (s) + VO3 E^o =-4.68.