The lanthanide contraction is responsible for the fact that

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Zr and Y have about the same Ionization energy.

Zr and Nb have similar oxidations state.

Zr and Hf have about the same radius.

Zr and Ce have the same oxidation state.

answer is C.

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Detailed Solution

Due to poor schielding of (n – 2)f – electrons, the size of Zr and Hf are same. Hence the actual radii is different. Due to the contraction the radius turns same.

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