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Q.

The lanthanoid contraction is responsible for the fact that(Atomic numbers: Zr = 40, Y = 39, Nb = 41, Hf = 72, Zn = 30)

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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

answer is C.

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Detailed Solution

A regular decreases in the size of the atoms and ions in lanthanide series from  La3+ to Lu3+   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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