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Q.

The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is :

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a

288 pm

b

618 pm

c

398 pm

d

144 pm

answer is D.

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Detailed Solution

For fcc,

2r++2r−=a

2(110)+2r−=508

r−=144pm

Hence, option D is correct.

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The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is :