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Extraction of Aluminium

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Question

In the extraction of aluminium from alumina, liquid cryolite is used. Give reason.

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Solution

Aluminium oxide has a very high melting point (over $2000^{o} C$ ) so it would be expensive to melt it. So it is dissolved in molten cryolite -which has a lower melting point than aluminium oxide. The use of cryolite reduces some of the energy costs involved in extracting aluminium.

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