What amount of electricity is required to deposit one mole of aluminium from a solution of AlCl3?

A. One Faraday
B. One ampere
C. Three Faradays
D. Three amperes

Correct Answer:

Option C – Three Faradays

Explanation

AlCl3 → Al3+ + 3Cl-
At cathode:
Al3+ + 3e- → Al
3 mole of electrons corresponds 3 F charge
So, required charge =3 F