Aluminium is extracted by the electrolysis of:

Bauxite

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Alumina

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Alumina mixed with molten cryolite

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Molten cryolite

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Solution

The correct option is D Alumina mixed with molten cryolite
Aluminium is extracted by the electrolysis of purified $A l_{2} O_{3}$ , which is mixed with $N a_{3} A l F_{6}$ or $C a F_{2}$ , which lowers the melting point of the mixture and brings conductivity. Steel cathode and graphite anode are used. The graphite anode is useful here for reduction to metal. The overall reaction may be taken as:
$A l_{2} O_{3} + 3 C \to 4 A l + 3 C O_{2}$

The process of electrolysis is widely known as the Hall-Heroult process.

Hence, the correct option is $C$ .

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