MetallurgyHard

Question

In the electrolysis of molten alumina during the manufacture of aluminium :

Options

A.Al2O3 undergoes dissociation
B.cryolite undergoes dissociation
C.Al2O3 and cryolite both undergo dissociation
D.Neither of the two undergoes dissociation

Solution

Na3AlF6         or    3NaF. AlF3
NaF Na+  + F-  ;    AlF3 Al3+ + 3F-

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