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Question

In the commercial electrochemical process of aluminium extraction, the electrolyte used is ________.​

A
aqueous Al2SO4
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B
Al(OH)3 in NaOH
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C
a molten mixture of Al2O3 and Na3AlF6
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D
a molten mixture of Al2O3 and Al(OH)3
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Solution

The correct option is C a molten mixture of Al2O3 and Na3AlF6
  • In the electrolytic extraction of aluminium, purified alumina is mixed with Na3AlF6 and CaF2.
  • Cryolite (Na3AlF6) helps dissolve alumina and lowers the melting point of this mix to about 1050 degrees celsius.
  • Pure alumina melts at about 2100 degrees celsius.
  • CaF2 is added to enhance the conductivity.

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