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The edge length of a face centred cubic ...

The edge length of a face centred cubic cell of an ionic crystal is 508 pm. If the radius of cation is 110 pm, the radius of anion will be :

A

288 pm

B

144 pm

C

618 pm

D

398 pm

Text Solution

Verified by Experts

The correct Answer is:
B
`2r^(+)+2r^(-)=a("edge length")`
`r^(-)=1//2(a-2r^(+))`
`=1//2(508-220)=144 "pm"`
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