Multiple choice

The ionic compound, which crystallises in corundum structure is

  1. CaO

  2. SrCl2

  3. Li2O

  4. ZnS

  5. Al2O3
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E Correct answer
Explanation

Corundum structure: Anions form hexagonal closest packing and cations are present in 2 / 3 of the octahedral holes. The general formula of the compound is M2O3. Examples: Fe2O3, Al2O3, Cr2O3, etc.

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