A solid binary compound XY has the Rock Salt () structure. If the radius of the cation is exactly , the ideal maximum radius of the anion before distortion occurs is:

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Question

A solid binary compound XY has the Rock Salt ($NaCl$) structure. If the radius of the cation $X^+$ is exactly $100 	ext{ pm}$, the ideal maximum radius of the anion $Y^-$ before distortion occurs is:

Prashant Kotian · Accepted Answer

Correct answer: B. In the rock salt structure, the cation occupies an octahedral void, so the minimum stable ratio is . Thus .

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