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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

285 pm

B

398 pm

C

144 pm

D

618 pm

Text Solution

Verified by Experts

The correct Answer is:
C
Distance between centres of cation and anion:
`d/2 = 508/2 = 254` pm
`r_( c) + r_(a) = 254 pm` or `110 + r_(a) = 254` or `r_(a) = 144` pm
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