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Q.

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii?  (Number in the parenthesis are atomic numbers)

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a

Zr(40) and Ta(73)

b

Zr(40) and Nb(41)

c

Zr(40) and Hf(72)

d

Ti(22) and Zr(40)

answer is A.

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Detailed Solution

Zr and Hf have nearly same atomic radii due to lanthanide contraction.

ElementRadius in ppm
Zr(40)145
Hf(72)144
Ta(73)134
Ti(22)132
Nb(41)134
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