Explain the following:(i) Zinc but not copper is used for recovery of

1.	Explain the following:(i) Zinc but not copper is used for recovery of Ag from the complex [Ag(CN)2]-. (ii) Partial roasting of sulphide ore is done in the metallurgy of copper. (iii) Extraction of Cu from pyrites is difficult than that from its oxide ore through reduction.
Answer» (i) Zn is more powerful reducing agent in comparison to copper. Zn is also cheaper than Cu. (ii) Partial roasting of sulphide ore forms some oxide. This oxide then reacts with remaining sulphide ore to give copper i.e. self-reduction occurs. 2Cu₂S + 3O₂ →2Cu₂O+2SO₂, 2Cu₂O+2Cu₂S→ 6Cu + SO₂. (iii) Though carbon is good reducing agent for oxide but it is poor reducing agent for sulphides. The reduction of metal sulphide does not have large negative value.

Explain the following:(i) Zinc but not copper is used for recovery of Ag from the complex [Ag(CN)2]-. (ii) Partial roasting of sulphide ore is done in the metallurgy of copper. (iii) Extraction of Cu from pyrites is difficult than that from its oxide ore through reduction.

Answer»

(i) Zn is more powerful reducing agent in comparison to copper. Zn is also cheaper than Cu.

(ii) Partial roasting of sulphide ore forms some oxide. This oxide then reacts with remaining sulphide ore to give copper i.e. self-reduction occurs.

2Cu₂S + 3O₂ →2Cu₂O+2SO₂,

2Cu₂O+2Cu₂S→ 6Cu + SO₂.

(iii) Though carbon is good reducing agent for oxide but it is poor reducing agent for sulphides. The reduction of metal sulphide does not have large negative value.

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Explain the following:(i) Zinc but not copper is used for recovery of Ag from the complex [Ag(CN)2]-. (ii) Partial roasting of sulphide ore is done in the metallurgy of copper. (iii) Extraction of Cu from pyrites is difficult than that from its oxide ore through reduction.

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