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  • 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

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 has a tendency to attain noble gas configuration

(iii) it has a tendency to attain f^{0}configuration

(iv) it resembles \text {Pb}^{4+}

Answers (1)

The answer is the option (ii, iii). The extra stability of empty, half-filled or completely filled f subshell gives rise to this irregularity. The noble gas configuration of \text {Ce(IV)} favours its formation.

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