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: 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.