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Question

In the extraction of aluminium by electrolytic process, cryolite is added to ________.

A
lower the melting point of alumina
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B
increase the electrical conductivity
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C
minimise the anode effect
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D
remove impurities from alumina
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Solution

The correct option is A lower the melting point of alumina
In the extraction of aluminium by electrolytic process, cryolite is added to reduce the melting temperature of the mixture. The use of cryolite reduces some of the energy costs involved in extracting aluminium.

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