In the extraction of aluminium
Process `X:` employed for red bauxite to remove iron oxide (main impurity)
Process `Y:` (Serpeck's process): used for while bauxite to remove `Z` (main impurity) then,
Select correct option for the process `X` and impurity `Z`.

Options

A. X = Hall and Heroult’s process and `Z = SiO_2`
B. X = Baeyer’s process and `Z = SiO_2`
C. X = Serpeck’s process and Z = iron oxide
D. X = Baeyer’s process and Z = iron oxide

Answer

B