Ncert Exercises & Solutions

The quantity of charge required to obtain one mole of aluminium from Al₂O₃ is :

1. 1 F

2. 6 F

3. 3 F

4. 2 F

HINT: Use Faraday's law of electrolysis.

Explanation:

The quantity of charge required to obtain one mole of aluminium from Al₂O₃ is equal to number of electron required to convert Al₂O₃ to Al.

${Al}^{3 +} (aq) \overset{+ 3 e^{-}}{⟶} Al (s)$

Hence, total 3F is required.