1.

During the extraction of copper, the concentrated ore is roasted so to remove the impurities of .. ..

Answer»

As and Sb 
Sb and FE 
Fe and As 
Fe and s 

SOLUTION :Copper ore is roasted so as to remove impurities of As and Sb in the FORM of their OXIDES. `4Sb + O_2 to Sb_2O_3`


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