In corundum,O2- ions from hcp and Al3+ occupy two third of octahedral voids. Determine the formula of corundum.
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Explanation:
In Corondum, only 2/3rd of Octahedral voids are occupied. It means corresponding to each oxide ion, there are 2/3 Aluminium ions. So, the whole number ratio is, 3:2 . Hence, Formula of Corondum = Al2O3 !!
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