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Although +3 is the characteristic oxidation state for langthanoids but certain also shows +4 oxidation state because "…...................."

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Solution :`._(58) Ce=[Xe]^(54) 4f^(2) 5d^(0)6S^(2) `. Hence, `Ce^(4+) = [Xe]^(54)4f^(0) `. Hence, (B) and (C ) are TRUE.


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