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Question

Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of:

A
Al2O3+HF+NaAlF4
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B
Al2O3+CaF2+NaAlF4
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C
Al2O3+Na3AlF6+CaF2
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D
Al2O3+KF+Na2AlF6
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Solution

The correct option is C Al2O3+Na3AlF6+CaF2
The electrolysis of pure alumina faces some difficulties. Pure alumina is a bad conductor of electricity.

The fusion temperature of pure alumina is about 2000C and at this temperature when electrolysis is carried out on the fused mass, the metal formed vaporizes, as the boiling point of aluminum is 1800C.

These difficulties are overcome by using a mixture containing alumina(Al2O3), cryolite (Na3AlF6), and fluorspar (CaF2).

Therefore, the correct option is C

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