Question
Question: In the electrolysis of molten alumina during the manufacture of aluminium :...
In the electrolysis of molten alumina during the manufacture of aluminium :
A
Al2O3 undergoes dissociation
B
Cryolite undergoes dissociation
C
Al2O3 and cryolite both undergo dissociation
D
Neither of the two undergoes dissociation
Answer
Cryolite undergoes dissociation
Explanation
Solution
Na3AlF6 or 3NaF. AlF3
NaF 
Na+ + F— ; AlF3 Al3+ + 3F—