Although +3 is the characteristic oxidation state for P lanthanoids...

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Although +3 is the characteristic oxidation state for
P lanthanoids but cerium also shows +4 oxidation state

W because
a. It has variable ionisation enthalpy
b. It has a tendency to attain noble gas configuration
c. It has a tendency to attain \( \mathrm{f}^{0} \) configuration
d. It resembles \( \mathrm{Pb}^{4+} \)
(1) \( a, b \)
(2) \( \quad b, c \)
(3) \( \mathrm{c}, \mathrm{d} \)
(4) \( a, d \)
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