Question

48. in corundum, oxide ions are arranged in hexagonal close packing and aluminium ions occupy two-third of the octahedral voids. What is the formula of corundum

Answer 1

Corundum (Al2O3): The chemical that is extremely hard and crystallized alumina is corundum.

They are used as an abrasive.

There are different varieties. Some of them are,

• Ruby
• Sapphire

Properties:

• Simple oxides insoluble in acids.
• Possess hardness with
• Chemical formula Al2O3

Hence, the chemical formula of corundum is Al2O3.