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Aluminium is extracted from bauxite by t...

Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question:
When bauxite is treated with sodium hydroxide solution, what happens to the aluminium oxide and iron (III) oxide?

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Aluminium oxide dissolves in sodium hydroxide and iron oxide does not dissolve.
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Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: Write the formula of cryolite.

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