Question:
Although +3 is the characteristic oxidation state for lanthanoids but cerium
also shows +4 oxidation state because ___________.
(i) it has variable ionisation enthalpy
(ii) it tends to attain the noble gas configuration
(iii) it tends to attain f 0 configuration
(iv) it resembles Pb4+
Solution:
Option (ii) and (iii) are the answers.