Question:
In Chrysoberyl, a compound containing Beryllium, Aluminium and oxygen, oxide ions form cubic close packed structure. Aluminium ions occupy th of octahedral voids. The formula of the compound is
In Chrysoberyl, a compound containing Beryllium, Aluminium and oxygen, oxide ions form cubic close packed structure. Aluminium ions occupy th of octahedral voids. The formula of the compound is
Updated On: Apr 1, 2025
- BeAlO4
- BeAl2O4
- Be2AlO2
- BeAlO2
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The Correct Option is B
Solution and Explanation
In the given compound, the oxide ions form a cubic close-packed structure. The aluminum ions occupy 1/4th of the tetrahedral voids and the beryllium ions occupy 1/4th of the octahedral voids.
- In a cubic close-packed structure, the number of tetrahedral voids and octahedral voids are both equal to 4.
- Aluminum occupies 1/4th of the tetrahedral voids, so it will occupy 1 tetrahedral void.
- Beryllium occupies 1/4th of the octahedral voids, so it will occupy 1 octahedral void.
- There are 4 oxide ions in the unit cell.
Therefore, the formula of the compound is .
Correct answer is (B):
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