Question 67

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


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