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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

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The correct Answer is:
d

Due to alnthanoid 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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