####5. A solid compound $X Y$ has $NaCl$ structure. If the radius of the cation is $100 pm$, the radius of the anion $(Y^{-})$will be :
[2011 M]
(a) $275.1 pm$
(b) $322.5 pm$
(c) $241.5 pm$
(d) $165.7 pm$
$=\frac{r^{+}}{r^{-}}=0.414$
$r^{-}=\frac{100}{0.414}=241.5 pm(r^{+}=100)$
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