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Extraction of Aluminium

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Question

Write the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.

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Solution

Cryolite is added during the extraction of Aluminum from Alumina.
The formula of Cryolite is $N a_{3} A l F_{6}$ .
It is added for reducing the melting point of Alumina, because Alumina has a high melting point.
So the compound added is Cryolite.

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