The Gibbs free energy 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 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.

Q. 33.8( 25 Votes )

Why is the extrac

Class 12th NCERT - Chemistry Part-I 6. General Principles and Processes of Isolation of Elements

Answer :

The Gibbs free energy formation ( Δ_fG) 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 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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