Although +3 is the characteristic oxidation state for lanthanoids, cerium shows-14.oxidationstate also because

Options

A. it has variablc ionisation enthalpy
B. it has a tendency w attain noble gas configuration
C. it has tendency to attain `f^0` configuration
D. it resembles `Pb^(4+)`

Answer

B, C

Explanation

`Ce= [Xe] 4f^1 5d^1 6s^2 , Ce^(4+) = [Xe]4f^0 `.Ce also shows +4 oxidation state because it has the tendency to attain noble gas configuration and 4 `f^0` configuration.