In the extraction of aluminium, the function of cryolite is to:

lower the melting point of alumina

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increase the melting point of alumina

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remove impurities from alumina

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minimise the anodic effect

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Solution

The correct option is A lower the melting point of alumina
Cryolite ( $N a_{3} A l F_{6}$ ) is a flux (or solvent) that allows alumina to melt at a lower temperature and feed the igneous electrolytic cells that operate at 900 to 1000.
Hence,the correct option is (A).

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A l_{2} O_{3}

In the electrolytic extraction of aluminium, the substances which are not used to reduce the melting point of alumina are:

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