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A solid compound $\mathrm{XY}$ has $\mathrm{NaCl}$ structure. If the radius of the cation is $100 \mathrm{pm}$, the radius of the anion $\left(\mathrm{Y}^{-}\right)$will be
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$322.5 \mathrm{pm}$
Radius ratio of $\mathrm{NaCl}$ like crystal $=\frac{r^{+}}{r^{-}}$
$=0.414$ or $r^{-}=\frac{100}{0.414}=241.5 \mathrm{pm}$
$=0.414$ or $r^{-}=\frac{100}{0.414}=241.5 \mathrm{pm}$
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