A) \[Zr\]and\[Zn\]have the same oxidation state
B) \[Zr\]and\[Hf\]have about the same radius
C) \[Zr\]and\[Nb\]have similar oxidation state
D) \[Zr\]and Y have about the same radius
Correct Answer: B
Solution :
Lanthanoid contraction compensated for the expected increase in atomic size while moving down the group. The net result is that the second and third transition series exhibit similar radii (e.g., Zr 160 pm, Hf 159 pm) and have very similar physical and chemical properties.
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