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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

288 pm

B

398 pm

C

618 pm

D

144 pm

Text Solution

Verified by Experts

The correct Answer is:
D
For an fcc crystal
`r_("cation") + r_("anion") = ("edge length")/(2)`
`110 + r_("anion") = 508/2`
`r_("anion") = 254 - 110 = 144` pm
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