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The edge length of a face centred cubic ...

The edge length of a face centred cubic cell of an ionic substance 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

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The correct Answer is:
A
For fcc structure , `(r^(+) + r^(-)) = a/2 = (508)/(2) = 254` pm
`r^+ = 110 rArr r^(-) = 254 - 110 = 144` pm
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