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Extraction of Aluminium

Question

What is the chemical formula of bauxite?
$A l_{2} S i O_{2} .2 H_{2} O$
$A l_{2} O_{3}$
$A l_{2} O_{3} .2 H_{2} O$
$N a_{3} A l F_{6}$

A

A l_{2} S i O_{2} .2 H_{2} O

B

A l_{2} O_{3} .2 H_{2} O

C

A l_{2} O_{3}

D

N a_{3} A l F_{6}

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Solution

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Chemical formula of bauxite is $A l_{2} O_{3} .2 H_{2} O$ . It is an important ore of aluminium.

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