The diagram depicts a cell that may be used to obtain a metal from its oxide. Molten aluminium oxide, copper(II) oxide, lead(II) oxide and magnesium oxide are each electrolysed in separate cells. Every cell receives the same number of electrons. Which statement is correct?
- AAll the metals can also be extracted from their oxides using coke.
- BThe anode and cathode should be made of the metal being extracted.
- CThe pure metal is always produced at the cathode.
- DThe same mass of each metal is formed.