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Give reason : Extraction of copper directly from sulphide ores is less favourable than that from its oxide ores through reduction. |
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Answer» Solution :(i) The standard free energy for the formation of `CuFeS_(2)` (copper pyrites) is GREATER than those of `CS_(2)` and `H_(2)S`. (ii) Hence, `CuFeS_(2)` cannot be reduced by carbon or HYDROGEN. (iii) HOWEVER, the free energy of copper OXIDE is less than that of `CO_(2)` . (IV) That is the reason, extraction of copper is easier from its oxide through reduction. |
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