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Frenkel Defect

If the distan...

Question

If the distance between $N a^{+}$ and $C l^{-}$ ions in NaCl crystal is 265pm, then edge length of the unit cell will be?

265 pm

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530 pm

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795 pm

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132.5 pm

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Solution

The correct option is B 530 pm
$a = 2 (r_{N a^{+}} + r_{C l^{-}})$
a = 2(265) = 530pm

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