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The edge length of a face-centred cubic ...

The edge length of a face-centred cubic unit cell is `508 pm`. If the radius of the cation is `110 pm` the radius of the anion is

A

144 pm

B

288 pm

C

618 pm

D

398 pm

Text Solution

Verified by Experts

The correct Answer is:
A
For face-centred cubic unit cell (e.g., that of NaCl), edge length = 2 x Distance between cation and anion =`2(r_c +r_a)`=508 pm (given ), Putting `r_c`=110 pm, we get `r_a`=144 pm
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