Question

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

• A. The +3 oxidation state of cerium is more stable than the +4 oxidation state
• B. The common oxidation states of cerium are +3and +4
• C. Cerium (IV) acts as an oxidizing agent
• D. The +4 oxidation state of cerium is not known in solutions

Answer 1

The correct option is D The +4 oxidation state of cerium is not known in solutions

The electronic configuration of cerium is: $\left[Xe\right]4f^{1}5d^{1}6s^2$

Cerium exhibit +4 oxidation state in solutions as well.