Question
Question: Aluminium is extracted by the electrolysis of :...
Aluminium is extracted by the electrolysis of :
A
Alumina
B
Bauxite
C
Moltencryolite
D
Alumina mixed with molten cryolite
Answer
Alumina mixed with molten cryolite
Explanation
Solution
Electrolyte consists of molten Al2O3, Na3AlF6 or CaF2. Cryolite or fluorspar lowers the melting point and increase the conductivity of electrolyte. So option (4) is correct.