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 :
Lanthanide contraction cancels almost exactly the normal size increases on descending a group of transition elements, thus Nb and Ta or Zr and Hf have same covalent and ionic radii.
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