Although +3 is the characteristic oxidation state

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.

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