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Grade: 12
        
courundum composed by aluminium and oxygen . oxides ions are arranged in h.c.p whearas auminium ions occupy 2/3 of total octahedral void. find formula of solids
10 months ago

Answers : (1)

Arun
14889 Points
							In ccp or hcp packing there is one octahedral void corresponding to each atom constituting the close packing. In corundum only 2/3rd of the octahedral voids are occupied. It means corresponding to each oxide are 2/3 aluminium ions. The whole number ratio of oxide and aluminium ion in corundum is therefore 3:2 Hence formula of corundum is Al2O3
						
10 months ago
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