In the extraction of aluminum from purified bauxite by electrolysis, cryolite is used because

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Chemistry JAMB 1979

In the extraction of aluminum from purified bauxite by electrolysis, cryolite is used because

  • it makes bauxite a better conductor of electricity
  • it makes bauxite melt at a lower temperature checkmark
  • it makes aluminium purer
  • it prevents aluminium from getting oxidized
  • it protects the carbon electrodes used in the process

The correct answer is: 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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