Question

Purification of aluminium, by electrolytic refining, is known as:
[1 Mark]

• A. Hoope’s process
• B. Baeyer’s process
• C. Hall’s process
• D. Serpeck’s process

Answer 1

The correct option is A Hoope’s process

Aluminium metal obtained from Hoope’s electrolytic refining process is about $99.9\%$ pure. The cell used for this process consists of three layers. The upper layer is pure $‘A{l}^{\prime }$, acts as cathode, the middle layer is mixture of fluorides of $Al$ and $Ba$, which acts as electrolyte. The lowest layer is impure $‘A{l}^{\prime }$, which acts as anode. On electrolysis pure $‘A{l}^{\prime }$ is transferred from the bottom to the top layer, through the middle layer.