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JEE Advanced 2010Paper 1
Exam
JEE Advanced
Year
2010
Paper
Paper 1
Subject
Chemistry
Chapter
General Principles and Processes of Isolation of Metals

JEE Advanced 2010 · Paper 1 · Chemistry · General Principles and Processes of Isolation of Metals

Paragraph: Copper is the most noble of the first row transition...

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 (CuSO4⋅5H2O)\left(\mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}\right), atacamite (Cu2Cl(OH)3)\left(\mathrm{Cu}_2 \mathrm{Cl}(\mathrm{OH})_3\right), cuprite \left(\mathrm{Cu}_2 \mathrm{O}\right),copperglance(Cu2 S), copper glance \left(\mathrm{Cu}_2 \mathrm{~S}\right) and malachite \left(\mathrm{Cu}_2(\mathrm{OH})_2 \mathrm{CO}_3\right).However,80%oftheworldcopperproductioncomesfromtheorechalcopyrite(CuFeS2). However, 80\% of the world copper production comes from the ore chalcopyrite \left(\mathrm{CuFeS}_2\right). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction.Question: In self-reduction, the reducing species is

Options

  1. AS\mathrm{S}
  2. BO2−\mathrm{O}^{2-}
  3. CS2−\mathrm{S}^{2-}
  4. DSO2\mathrm{SO}_2

Correct answer

C. S2−\mathrm{S}^{2-}

Step-by-step solution

S2−\mathrm{S}^{2-} acts as reducing species 2Cu2O+Cu2 S2−⟶6Cu+SO22 \mathrm{Cu}_2 \mathrm{O}+\mathrm{Cu}_2 \mathrm{~S}^{2-} \longrightarrow 6 \mathrm{Cu}+\mathrm{SO}_2 Metallurgy Conceptual III, II, II
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