JEE Main 2005 Chemistry question

The lanthanide contraction is responsible for the fact that

(1)Zr and Y have about the same radius
(2)Zr and Nb have similar oxidation state
(3)Zr and Hf have about the same radiusCorrect
(4)Zr and Zn have the same oxidation

Answer: (3)

Solution

The steady contraction across the 14 lanthanides cancels the expected size increase from the 4d to the 5d series, so the 5d elements following the lanthanides

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Question ID VK-038642