| 1. \[MgO:{{r}_{c}}=0.65\overset{\text{o}}{\mathop{\text{A}}}\,\,;\,\,{{r}_{a}}=1.40\overset{\text{o}}{\mathop{\text{A}}}\,,\] |
| 2. \[MgS:{{r}_{c}}=0.65\overset{\text{o}}{\mathop{\text{A}}}\,\,;\,{{r}_{a}}=1.84\overset{\text{o}}{\mathop{\text{A}}}\,,\] |
A) 6, 4
B) 4, 6
C) 3, 4
D) 6, 8
Correct Answer: A
Solution :
[a] For \[MgO,=\frac{{{r}_{c}}}{{{r}_{d}}}=\frac{0.65}{1.4}=0.47\] \[M{{g}^{2+}}\] is in octahedral void so C.N. = 6 For \[MgS,\frac{{{r}_{c}}}{{{r}_{a}}}=\frac{0.65}{1.84}=0.353\] \[M{{g}^{2+}}\] is in tetrahedral void so C.N. = 4
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