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Identify a 'Chemical twin' among the foo...

Identify a 'Chemical twin' among the foolowings.

A

Zr-Ta

B

Nb-Tc

C

Hf-Re

D

Nb-Ta

Text Solution

Verified by Experts

The correct Answer is:
D

Due to lanthanoid contraction on moving down the group, atomic or ionic radii becomes similar. Hence,
Nb-Ta have similar atomic radii and called, chemical-twin.
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