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Question: Answered & Verified by Expert
A solid compound $X Y$ has $\mathrm{NaCl}$ structure. If the radius of the cation is $100 \mathrm{pm}$, the radius of the anion ( $Y^{-}$) will be
ChemistrySolid StateNEETNEET 2011 (Mains)
Options:
  • A $275.1 \mathrm{pm}$
  • B $322.5 \mathrm{pm}$
  • C $241.5 \mathrm{pm}$
  • D $165.7 \mathrm{pm}$
Solution:
2926 Upvotes Verified Answer
The correct answer is: $241.5 \mathrm{pm}$
Radius ratio of $\mathrm{NaCl}$ like crystal $=\frac{r^{+}}{r^{-}}=0.414$ or $r^{-}=\frac{100}{0.414}=241.5 \mathrm{pm}$

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