Question

The general oxidation states shown by $Ce$ (cerium) in its compounds are:

• A. +2, +3
• B. +2, +4
• C. +3, +5
• D. +3, +4

Answer 1

Answer: (D)

The common stable oxidation state of all the lanthanides is $+3$. The oxidation states of $+2$ or $+4$ can also exhibited only in those cases where stable $4f^0,4f^7$ or $4f^{14}$ configurations are achieved. $C{e}^{4+}$ is stable due to $4f^0$ configuration.