Question

The diagram shows the sketch of an electrolytic cell used in the extraction of aluminium. At which electrode (A or B) is the aluminium formed?

• A. A (Cathode)
• B. B (Anode)
• C. At both A and B
• D. Cannot be determined

Answer 1

The correct option is A A (Cathode)

Aluminium ions receive electrons at the negative electrode(Cathode) and are reduced to aluminium atoms:

$A{l}^{3+}+3e^{–}\to Al$ (reduction – gain electrons)

The molten aluminium sinks to the bottom of the cell, where it is tapped off.