In the extraction of aluminum from purified bauxite by electrolysis, cryolite is used because
A. it makes bauxite a better conductor of electricity B. it makes bauxite melt at a lower temperature C. it makes aluminium purer D. it prevents aluminium from getting oxidized E. it protects the carbon electrodes used in the process
Correct Answer: 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.
