Question

Purification of aluminium, by electrolytic refining, is known as

(a) Hoope's process

(b) Bayer's process

(c) Hail's process

(d) Serpeck's process

Answer 1

Correct option (a) Hoope's process

Explanation :

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 ripper layer is pure 'Al', acts as cathode, the middle layer is mixture of fluorides of Al and Ba. which acts as electrolyte. The lowest layer is impure 'Al', which acts as anode. On electrolysis Pure 'Al' is transferred from the bottom to the top layer. through the middle layer.