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 :
The limiting radius ratios (of cation and anion) play a very important role in giving a due to the nature of crystal structure of the ionic substance.S. No. | Limiting radius ratio \[(r+r-)\] | Shape | Co- ordi-nation number | Example |
1. | Less than 0.225 | Linear | 2 or 3 | \[{{B}_{2}}{{O}_{3}}\] |
2. | 0.225- 0.414 | Tetrahe-dral | 4 | \[CuCl,\]\[CuBr,\]\[BaS,CuI\] |
3. | 0.414- 0.732 | Square planer for 4 and octahed ral for 8 | 4 or 6 | \[MgO,\]\[NaBr,\]\[MnO,\] \[KBr,\] \[AgCl,\] \[NaCl\] |
4. | 0.732- more | Cube | 8 | \[CsI,CsBr,\] \[N{{H}_{4}}Br\] |
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