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Why is the extraction of copper form pyries more difficult then that from its oxide ore through reduction? |
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Answer» The extraction of copper from pyrites is more difficult than that from its oxide ore through reduction. Explanation : Pyrites `(Cu_(2)S)` cannot be reduced by carbon (or) hydrogent because the standard free energy of formation `(DeltaG^(@))` of `Cu_(2)S`is greater then those of `CS_(2)` and `H_(2)S`. `{:(2Cu_(2)S+Crarr4Cu+CS_(2)),(Cu_(2)S+H_(2)rarrCu+H_(2)S):}}" Not feasible"` `rarr` The `DeltaG^(@)` of copper oxide is less than that of `CO_(2)`. `therefore`The sulphide ore is first converted to oxide by roasting and then reduced. `2Cu_(2)S+3O_(2)underset("heat")overset("Roasting")rarr2Cu_(2)O+2SO_(2)` `2Cu_(2)O+Crarr4Cu+CO_(2)["feasible"]`. |
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