Aluminium and copper are extracted from their oxide and sul…

Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) General Single Correct MCQ

Published on: August 13, 2026

Aluminium and copper are extracted from their oxide and sulphide ores respectively. Which of the following is correct?

I. Copper is extracted by the auto reduction of copper oxide by copper sulphide

II. Aluminium cannot be obtained by chemical reduction due to its strong affinity for oxygen

III. In electrometallurgy of Al, graphite is used as cathode to avoid reoxidation of Al into Al 2 O 3 by preventing formation of O 2 .

IV. Sulphide ores of copper are difficult to be reduced than the oxide ores

I, II, IV

II and III

II and IV

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