GCSE / O Levels Chemistry

An old commercial process for aluminium extraction used large quantities of sodium to convert
aluminium ions into aluminium atoms.
The modern aluminium extraction process uses electrolysis.
Which statements are correct?
In the old process:
1
The sodium acted as an oxidising agent.
2
The reaction worked because sodium is more reactive than aluminium.
In the modern process:
3
The equation for the cathode reaction is Al*(1) + 3e → Al(1).
4
The carbon anode needs replacing often because it is oxidised to carbon dioxide by
the oxygen evolved.
old process
modern process
A
1 and 2
3 and 4
B
1 and 2
3 only
1 only
4 only
2 only
3 and 4


Aluminium | 2018 - O/N - 5070/11 | Q29