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In corundum, oxide ions are arranged in ...

In corundum, oxide ions are arranged in hexagonal close packing and aluminium ionsa occpy tow-third of the octaheral voids. What is the formula of corrundum ? .

Text Solution

Verified by Experts

The correct Answer is:
`ABO_(3)`
Suppose oxide ions = n . Then octahedral voids = n Hence, ` Al^(3+) " ions" = 2/3 xx n = (2n)/3`
Ratio ` Al^(3+) : O^(2-) = (2n)/ 3 : n = 2: 3` formula is ` Al_(2)O_(3)` \
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