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

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

Electrolyte is ${Al}_{2} O_{3}$ dissolved in ${Na}_{3} {AlF}_{6}$ containing a little of ${CaF}_{2}$

Bauxite ore is purified before carrying out the electrolysis

Anode consists of a number of graphite rods which are periodically replaced

answer is C.

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Detailed Solution

Aluminium is more dense than the alumina/cryolite solution and so it falls to the bottom of the cell where it can be tapped off as pure liquid metal.

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