Question

Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:
A. in the presence of `NaCl`
B. `in the presence of fluorite
C. in the presence of cryolite which forms a melt with higher melting temperature
D. in the presence of cryolite which forms a melt with lower melting temperature

Answer 1

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