1.

In aluminium oxide, the oxide ions are arranged in hexagonal close packed (hcp) arrangement and the aluminium occupy 2//3 of octahedral voids. What is the formula of oxide ?

Answer»


Solution :Number of octahedral sites corresponding to each atom in hcp=1
Number of OXYGEN (O) atoms = 1
It is GIVEN that `2//3` of the octahedral sites are OCCUPIED by aluminium ions.
Hence, for each oxide ion, there will be `2//3` aluminium ions. so, number of AL atoms = `2//3`
Hence, the formula of the oxide = `Al_(2//3) O_1` or `Al_2O_3`


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