A) 0 to 0.155
B) 0.225 to 0.414
C) 0.155 to 0.225
D) 0.414 to 0.732
Correct Answer: B
Solution :
Limiting radius ratio The ratio of the radius of cation \[({{r}^{+}})\] to that of anion \[({{r}^{-}})\] is known as limiting radius ratio. It plays an important role in the crystal structure of ionic substance.| Limiting radius ratio \[\left( \frac{{{r}^{+}}}{{{r}^{-}}} \right)\] | Shape | Coordination number | Example |
| 1. 0.155 - 0.225 | Plane trigonal | 3 | Boronoxide |
| 2. 0.225 - 0.414 | Tetrahedral | 4 | ZnS |
| 3. 0.414 - 0.732 | Square planar | 4 | - |
| 4.0.414 - 0.732 | Octahedral | 6 | AgCl, MgO, NaBr |
| 5. 0.732 - 1.00 | Cubic | 8 | CsCl, CsBr |
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