question_answer

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

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

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

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

D) Cerium (IV) acts as an oxidizing agent

Correct Answer: C

Solution :

+ 3 and + 4 states are shown byin aqueous solution. Thus statement (c) is incorrect.