Chemical formula of corundum is

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${Al}_{2} O_{3}$

${Al}_{2} O_{3} . H_{2} O$

SiC

${Al}_{2} O_{3} . 2 H_{2} O$

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 ${Al}_{2} O_{3}$

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