In the extraction of aluminium from bauxite in Jamaica, cryolite is added to the aluminium oxide. What is the main purpose of adding cryolite?

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Question

In the extraction of aluminium from bauxite in Jamaica, cryolite is added to the aluminium oxide. What is the main purpose of adding cryolite?

Accepted Answer

To lower the melting point of aluminium oxide — Award 1 mark for identifying that cryolite reduces the melting point from about 2050°C to about 950°C, making the process economically viable. A is incorrect — though conductivity may be affected, this is not the main purpose. C is incorrect — aluminium sinks and is protected. D is incorrect — cryolite does not purify the aluminium.

Answer

To prevent oxidation of the aluminium produced

Answer

To lower the melting point of aluminium oxide

Answer

To increase the purity of the aluminium

Answer

To increase the conductivity of the electrolyte

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