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Q.

Chemical formula of corundum is

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a

Al2O3

b

Al2O3.H2O

c

SiC

d

Al2O3.2H2O

answer is D.

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Detailed Solution

Corundum is best known for its gem varieties, ruby and sapphire.

Corundum is very hard, tough, and stable mineral. Rubies are scientifically known as corundum,

A rock-forming mineral and crystalline form of aluminium oxide which is two aluminium atoms

And three oxygen atoms in a close packed hexagonal structure.

Hence , the formula of corundum is  Al2O3

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