In chromium chloride `(CrCl_(3), Cl^(-)` ions have cubic close packed arragement and `Cr^(3+)` ions are present in the octahedral holes. The fraction
In chromium chloride `(CrCl_(3), Cl^(-)` ions have cubic close packed arragement and `Cr^(3+)` ions are present in the octahedral holes. The fraction of the total number of holes occupied is
A. `1//3`
B. `1//6`
C. `1//9`
D. `1//12`
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Correct Answer - C
In `CrCl _(3)`, for every, 3 `Cl^(-)` ions there is one `Cr^(3+)` ions. Thus , if there are `3 Cl^(-)` ions in the packing, octahedral voids = 3, tetrahedral voids = 6. Total voids = 3 + 6 = 9 . As 1 `Cl^(3+)` ion is present in the void, therfore fractionof holes occupied `= 1//9`
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