Cerium (Z = 58) is an important member of the lanthanoids. Which of the following
statements about cerium is incorrect?
The common oxidation states of cerium are +3 and +4
Cerium (IV) acts as an oxidizing agent
The +4 oxidation state of cerium is not known in solutions
The +3 oxidation state of cerium is more stable than the +4 oxidation state
