Q.

Statement-1: Lanthanum (Z=57) exhibits +4 oxidation state.
Statement-2: After the loss of 6s and 5d electrons, lanthanum achieves inert gas like configuration. 

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a

Statement-I is True, Statement-2 is False.

b

Statement-1 is True, Statement-2 is True; Statement-2 is not a correct explanation for Statement-1

c

Statement-I is False, Statement-2 is True.

d

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1. 

answer is D.

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