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.