Question

What amount of electricity can deposit $1$ mole of $Al$ metal at cathode when passed through molten $AlCl_3$

• A. 0.3 F
• B. 1 F
• C. 3 F
• D. 1/3 F

Answer 1

Answer: (C)

3 F

Answer 2

The number of electrons involved in the reaction are three as shown below

$Al ^{3+}+3 e^{-} \longrightarrow Al$

It means the conversion of every aluminium ion to aluminium atom requires three electrons.

Therefore, the amount of electricity required for one mole of $Al ^{3+}$ ions $=3 F$.