Which of the following statements regarding the metallurgy of aluminium by electrolytic method is not correct?

Options

A. Electrolyte is `Al_2O_3` dissolved in `Na_3AlF_6` containing a little of `CaF_2`
B. Anode consists of a number of graphite rods which are periodically replaced
C. Aluminium being heavier than electrolyte floats over the surface of the latter
D. Bauxite ore is purified before carrying out the electrolysis

Answer

C

Explanation

Aluminium being heavier than electrolyte floats over the surface of the latter