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Copper is the most noble of first row transition metals and occurs in small deposits in serveral countries. Ores of copper include chalcanthite `(CuSO_(4).5H_(2)O)`, atacanite `[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 chalcopyrite involves partial roasting, removal of iron and self-reduction. In self-reduction, the reducing species is.A. SB. `O^(2-)`C. `S^(2-)`D. `SO_(2)` |
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Answer» Correct Answer - C Self-reduction : `Cu_(2)S + 2Cu_(2) O rarr 6Cu + SO_(2)` The oxidation number of sulphur increases from `-1` to `+4`. Therefore, `S^(2-)` is the reducing species. |
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