MetallurgyHard

Question

In the commercial electrochemical process for aluminium extraction, the electrolyte used is :

Options

A.Al (OH)3 in NaOH solution
B.an aqueous solution of Al2(SO4)3
C.a molten mixture of Al2O3 and Na3AlF6 
D.a molten mixture of AlO(OH) and Al(OH)3

Solution

In the extraction od Al, a melt of Al2O3 (Alumina) and Na3AlF6 (Cryolite) is electrolysed. Na3AlF6 reduces the fusion temperature and increases the conductance of melt.

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