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Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite \(\left(\mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}\right)\), atacamite \(\left(\mathrm{Cu}_2 \mathrm{Cl}(\mathrm{OH})_3\right)\), cuprite \(\left(\mathrm{Cu}_2 \mathrm{O}\right)\), copper glance \(\left(\mathrm{Cu}_2 \mathrm{~S}\right)\) and malachite \(\left(\mathrm{Cu}_2(\mathrm{OH})_2 \mathrm{CO}_3\right)\). 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:
Partial roasting of chalcopyrite produces

1. A \(\mathrm{Cu}_2 \mathrm{~S}\) and \(\mathrm{FeO}\)
2. B \(\mathrm{Cu}_2 \mathrm{O}\) and \(\mathrm{FeO}\)
3. C \(\mathrm{CuS}\) and \(\mathrm{Fe}_2 \mathrm{O}_3\)
4. D \(\mathrm{Cu}_2 \mathrm{O}\) and \(\mathrm{Fe}_2 \mathrm{O}_3\)