Chemistry
JAMB 1979
In the extraction of aluminum from purified bauxite by electrolysis, cryolite is used because
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A.
it makes bauxite a better conductor of electricity
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B.
it makes bauxite melt at a lower temperature
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C.
it makes aluminium purer
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D.
it prevents aluminium from getting oxidized
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E.
it protects the carbon electrodes used in the process
Correct Answer: Option B
Explanation
The bauxite is purified to yield a white powder, aluminium oxide, from which aluminium can be extracted. The extraction is done by electrolysis. ... Instead, it is dissolved in molten cryolite, an aluminium compound with a lower melting point than aluminium oxide.
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