MHT CET Chemistry question

Lanthanoid contraction is caused due to

(A)the appreciable shielding on outer electrons by 4f-electrons from the nuclear charge
(B)the appreciable shielding on outer electrons by 5d-electrons from the nuclear charge
(C)the same effective nuclear charge from Ce to Lu
(D)the imperfect shielding on outer electrons by 4f-electrons from the nuclear chargeCorrect

Answer: (D)

Solution

The 4f electrons shield the outer electrons poorly (imperfectly), so the effective nuclear charge increases from Ce to Lu and the size

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Question ID VK-074844