JEE Advanced Chemistry question

Due to lanthanide contraction

(A)Fe, Co, Ni have equal size
(B)Zr and Hf have equal sizeCorrect
(C)All f-block ions have equal size
(D)All isoelectronic ions have equal size

Answer: (B)

Solution

The steady contraction in ionic radius across the lanthanides (caused by poor shielding) means that, by the time the 5d series begins, the extra shell expansion expected on descending

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Question ID VK-159851