The CsCl type structure is exhibited by alkali halides only when the radius of the cation is large enough to keep touching its eight nearest neighbour anions. Below what minimum ratio of cation to anion radii $(\frac{r_{+}}{r_{-}})$ this contact is prevented ?

0.225

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0.414

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0.632

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0.732

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Solution

The correct option is D
0.732

CsCl is a 8 : 8 coordination compound i.e., $C s^{+}$ ion occupies a cubic hole of $C l^{-}$ ions packing. For exact fitting of cubic hole, the radii ratio $\frac{r_{+}}{r_{-}}$ must be 0.732.

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The CsCl type structure is exhibited by alkali halides only when the radius of the cation is large enough to keep touching its eight nearest neighbour anions. Below what minimum ratio of cation to anion radii (r+r−) this contact is prevented ?

The correct option is D 0.732 CsCl is a 8 : 8 coordination compound i.e., Cs+ ion occupies a cubic hole of Cl− ions packing. For exact fitting of cubic hole, the radii ratio r+r− must be 0.732.

The CsCl type structure is exhibited by alkali halides only when the radius of the cation is large enough to keep touching its eight nearest neighbour anions. Below what minimum ratio of cation to anion radii $(\frac{r_{+}}{r_{-}})$ this contact is prevented ?

The correct option is D
0.732

CsCl is a 8 : 8 coordination compound i.e., $C s^{+}$ ion occupies a cubic hole of $C l^{-}$ ions packing. For exact fitting of cubic hole, the radii ratio $\frac{r_{+}}{r_{-}}$ must be 0.732.