Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:

Options

A. in the presence of `NaCl`
B. in the presence of fluorite
C. in the presence of cryolite which forms a melt with lower melting temperature
D. in the presence of cryolite which forms a melt with lower melting temperature

Answer

C

Explanation

Addition of crolite makes the fuse melt at lower melting temperature as well as good conductor of current.