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Which one of ...

Question

Which one of the following is used in the extraction of aluminium by electrolytic process?

A

A l_{2} O_{3}

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B

A l (O H)_{3}

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C

A l C l_{3}

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D

A l_{2} (S O_{4})_{3}

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Solution

The correct option is C $A l_{2} O_{3}$
In the metallurgy of aluminium, purified $A l_{2} O_{3}$ is mixed with $N a_{3} A l F_{6}$ or $C a F_{2}$ which lowers the melting point of the mix and brings conductivity.

$2 A l_{2} O_{3} + 3 C \to 4 A l + 3 C O$

This process of electrolysis is widely known as Hall-Heroult process.

Option A is correct.

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