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Q.

If the radius of ${Cl}^{-}$ ion is 181 pm, and the radius of ${Na}^{+}$ ion is 101 pm then the edge length of unit cell is :

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a

564 pm

b

282 pm

c

512 pm

d

288.70 pm

answer is D.

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Detailed Solution

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$2 r_{+} + 2 r_{-} = a$

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