Question

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

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

Answer 1

The correct option is C The +4 oxidation states of cerium is not known in solutions.

Cerium have $\left[Xe\right]4f^{1}5d^{1}6s^2$ configuration and it shows +3 oxidation. So, +4oxidation states of cerium is not known in solutions.