Question

Anode in the electrolysis process of aluminium
a.carbon rods
b.gas carbon lining​

Answer 1

Answer:

The electrolysis of pure alumina faces some difficulties. Pure alumina is a bad conductor of electricity. The fusion temperature of pure alumina is about 2000

∘

C and at this temperature when electrolysis is carried out on the fused mass, the metal formed vaporizes, as the boiling point of aluminium is 1800

∘

C. These difficulties are overcome by using a mixture containing alumina, cryolite (Na

3

,AlF

6

), and fluorspar (CaF

2

,). But the addition of cryolite do not minimize the anode effect and do not remove the impurities from alumina.