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JEE Advanced2010ChemistryGeneral Principles and Processes of Isolation of MetalsActual

Paragraph: Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite ( CuSO ₄ 5 H ₂ O ) , atacamite ( Cu ₂ Cl ( OH )₃ ) , cuprite ( Cu ₂ O ) , copper glance ( Cu ₂ ~S ) and malachite ( Cu ₂( OH )₂ CO ₃ ) . However, 80 % of the world copper production comes from the ore chalcopyrite ( CuFeS ₂ ) . The extraction of copper from chal

Options

  1. AS
  2. BO ²⁻
  3. CS ²⁻
  4. DSO ₂

Correct answer

C. S ²⁻

Step-by-step solution

S ²⁻ acts as reducing species 2 Cu ₂ O + Cu ₂ ~S ²⁻ 6 Cu + SO ₂ Metallurgy Conceptual III, II, II

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