Question

Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.

Answer 1

• In the Hall-Heroult’s process, the electrolytic reduction of alumina takes place.
• At the cathode, reduction reaction takes place whereas at the anode, oxidation reaction takes place.
• When electricity is passed through the electrolyte solution, the aluminium ions get collected at the cathode.
• The reaction taking place at the cathode is:

$A{l}^{3+}+3e^{-}\to Al$