A compound formed by Mg, Al and O, is found to have cubic close array of oxide ions in which Mg 2+ occupying 1 8 th of tetrahedral voids and Al 3+ ions occupying 1 2 the octahedral voids. The formula for the compound is

1. A. MgAlO
2. B. MgAl4O2
3. C. Mg2Al3O2
4. D. MgAl2O4

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