Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ors 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))`. However , `80%` of the world copper production comes from the ore chalcopyrite `(CuFeS_(2))`. the extraction of copper from chalcopyrite involves partial roasting, removla of iron and self- reduction. Iron is removed from chalcopyrite as
