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Question

Aluminum is obtained by

A
Heating alumina with iron
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B
Heating alumina with coke
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C
Electrolysis of alumina solution in molten cryolite
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D
Electrolysis of fused aluminum chloride
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Solution

The correct option is C Electrolysis of alumina solution in molten cryolite
The extraction is done by electrolysis. The ions in the aluminium oxide must be free to move so that electricity can pass through it. Aluminium oxide has a very high melting point (over 2000C) so it would be expensive to melt it. Aluminium oxide does not dissolve in water, but it does dissolve in molten cryolite.

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