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Q.

The lanthanide contraction is responsible for the fact that

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a

Zr and Y have about the same Ionization energy.

b

Zr and Nb have similar oxidations state.

c

Zr and Hf  have about the same radius.

d

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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