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Question

The lanthanoid contraction is responsible for the fact that-

A
Zr and Y have about the same radius
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B
Zr and Nb have simillar oxidation state
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C
Zr and Hf have about the same radius
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D
Zr and Zn have simillar oxidation state
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Solution

The correct option is C Zr and Hf have about the same radius
The elements of second and third transition series resembles more in properties than the elements of first and second transition series. It is due to lanthanide contraction. So, due to lanthanide contraction Zr and Hf have the same radius and also known as twins.

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