Copper is the most noble of the first transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO_(4).5H_(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)). Howerver 80% of the world copper production comes from the ore chalcopyrites (CuFeS_(2)) the extraction of copper from chalcopyrites involves partial roasting of iron and self reduction. Q. In self reduction the reducing species is .... Select the correct options for blank.

Copper is the most noble of the first transition metals and occurs in

1.	Copper is the most noble of the first transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO_(4).5H_(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)). Howerver 80% of the world copper production comes from the ore chalcopyrites (CuFeS_(2)) the extraction of copper from chalcopyrites involves partial roasting of iron and self reduction. Q. In self reduction the reducing species is .... Select the correct options for blank.
Answer» `Cu^(+)` `O^(-2)` `S^(-2)` `SiO_(2)` Solution :`2CuFeS_(2)+4O_(2)overset(DELTA)toCu_(2)S+2FeO+3SO_(2)` `Cu_(2)S+FeO+SiO_(2)toFeSiO_(3)` (FUSIBLE slag) `+Cu_(2)S` (MATTE)