A) Zr and Y have about the same radius
B) Zr and Nb have similar oxidation state
C) Zr and Hf have about the same radius
D) Zr and Zn have the same oxidation state
Correct Answer: C
Solution :
A regular decrease in the size of the atoms and ions in lanthanoid series from \[{{\operatorname{La}}^{3+}}\,\,to\,\,L{{u}^{3+}}\] is called lanthanide contraction. The similarity in size of the atoms of Zr and Hf is due to the lanthanide contraction.
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