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# A solid $A^+ B^−$ has NaCl type close packed structure. If the anion has a radius of 250 pm, what should be the ideal radius of the cation? Can a cation $C^+$ having a radius of 180 pm be slipped into the tetrahedral site of the crystal $A^+ B^−$ ? Give reason for your answer.

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## 1 Answer

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0.72
Hence (A) is the correct answer.
answered May 30, 2014