Question

During the electrolysis of cryolite, aluminium and fluorine are found in _______molar ratio.

• A. 1 : 2
• B. 2 : 3
• C. 1 : 1
• D. 1 : 3

Answer 1

The correct option is B 2 : 3

From the first mechanism, it can be seen that the Aluminum is reduced at cathode and Florine is oxidized at anode.
The ratio of aluminium and fluorine is the ratio of their change in oxidation number, i.e. $2:3$
Hence the correct option is B.