Question

The quantity of charge required to obtain one mole of aluminum from $Al_{2}O_{3}$is _______.

• A. 1 F
• B. 6 F
• C. 3 F
• D. 2 F

Answer 1

Answer: (C)

3 F

Answer 2

$Al_{2}O_{3} \rightarrow 2Al$

$2Al^{3 +} + 6e^{-} \rightarrow 2Al$

$\therefore Al^{3 +} + 3e^{-} \rightarrow Al$

Thus, 3 F of charge is required to obtain 1 mole of Al from $Al_{2}O_{3}$