Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?

Question

(1) The common oxidation states of cerium are +3 and +4

 

(2) Cerium (IV) acts as an oxidizing agent

 

(3) The +4 oxidation state of cerium is not known in solutions

 

(4) The +3 oxidation state of cerium is more stable than the +4 oxidation state