What is the most common method for producing aluminium from its ore?
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A.
Smelting
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B.
Leaching
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C.
Electrolytic reduction
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D.
Blast furnace process
Correct Answer:
C. Electrolytic reduction
Explanation:
Electrolytic reduction, specifically the Hall-Heroult process, is the primary industrial method for extracting aluminium from its ore, bauxite. Because aluminium is a highly reactive metal, standard chemical reduction using carbon is ineffective. Instead, the ore is first refined into alumina (aluminium oxide) and then dissolved in a molten cryolite bath. An electric current is passed through this solution, which breaks the chemical bonds and allows pure liquid aluminium to settle at the bottom of the electrolytic cell for collection.
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