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Electrolytic reduction cell used for conversion of calcined Al 2 O 3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to

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  1.  achieve very high purity of aluminium (99.9%).

  2.  keep the electrolyte in liquid condition by the generation of heat.

  3.  electrolytically dissociate alumina.

  4.  both(b) & (c).

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