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 lower melting temperature 

(d) in the presence of cryolite which forms a melt with higher melting temperature

Answer 1

The correct option (c) in the presence of cryolite which forms a melt with lower melting temperature

Explanation:

Cryolite is used to lower the melting point of alumina (Al₂O₃) as well as to make it a good conductor of electric current.