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In Corundum, oxide ions are arranged in hcp arrangement and aluminium ions occupy two third of the octahedral holes. Its formula is _______.

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In Corundum, oxide ions are arranged in hcp arrangement and aluminium ions occupy two third of the octahedral holes. Its formula is _______. 

(A) Al2O3 

(B) Al2O4 

(C) Al2O2 

(D) AlO2

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1 Answer

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Best answer

Correct option: (A) Al2O3

Explanation:

There is one octahedral hole per oxide ion and only (2/3)rd of these holes are occupied.

∴ the ratio should be 2/3 : 1 = 2 : 3

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