MetallurgyHardBloom L3

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 ,Na3AlF6 & CaF2
D.a molten mixture of Al2O3 and Al(OH)3

Solution

Sol. Mixture of $(\overset{20\%}{Al_{2}O_{3}} + \overset{60\%}{Na_{3}AlF_{6}} + \overset{20\%}{CaF_{2}})$

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