SELECT * FROM question_mgmt as q WHERE id=1879 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=61 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?

Answer:

The Gibbs free energy of formation (ΔfG) of Cu2S is less than that of H2S and CS2. Therefore, H2 and C cannot reduce Cu2S to Cu.

On the other hand, the Gibbs free energy of formation of Cu2O is greater than that of CO. Hence, C can reduce Cu2O to Cu.

C(s) +Cu2O(s)   →   2Cu(s) + CO(g)

Hence, the extraction of copper from its pyrite ore is difficult than from its oxide ore through reduction.


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