Extraction of Metals - Result Question 35

####35. In the commercial electrochemical process for aluminium extraction, the electrolyte used is

(1999,2M)

(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

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Solution:

  1. Al2O3 mixed with cryolite Na3[AlF6] is fused and electrolysed in the extraction of Al.


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