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The correct statement(s) related to the metal extraction processes is/are:
  • a)
    A mixture of PbS and PbO undergoes self-reduction to produce Pb and SO2.
  • b)
    In the extraction process of copper from copper pyrites, silica is added to produce copper silicate.
  • c)
    Partial oxidation of sulphide ore of copper by roasting followed by self-reduction produces blister copper.
  • d)
     In cyanide process, zinc powder is utilized to precipitate gold from Na[Au(CN)2].
Correct answer is option 'A,C,D'. Can you explain this answer?
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The correct statement(s) related to the metal extraction processes is/...
Metal Extraction Processes

Self-Reduction of PbS and PbO

- A mixture of PbS and PbO undergoes self-reduction to produce Pb and SO2.
- The reaction can be represented as: 2PbS + 2PbO → 4Pb + 2SO2.

Addition of Silica in Copper Extraction

- In the extraction process of copper from copper pyrites, silica is added to produce copper silicate.
- The reaction can be represented as: CuFeS2 + 2SiO2 + 4O2 → CuSiO3 + FeSiO3 + 2SO2.

Partial Oxidation of Copper Sulphide Ore

- Partial oxidation of sulphide ore of copper by roasting followed by self-reduction produces blister copper.
- The reaction can be represented as: 2Cu2S + 3O2 → 2Cu2O + 2SO2, 2Cu2O + Cu2S → 6Cu + SO2.

Cyanide Process for Gold Extraction

- In cyanide process, zinc powder is utilized to precipitate gold from Na[Au(CN)2].
- The reaction can be represented as: 2Au(CN)2^- + Zn → 2Au + Zn(CN)4^-.

Conclusion

In summary, the correct statements related to the metal extraction processes are: a) A mixture of PbS and PbO undergoes self-reduction to produce Pb and SO2. c) Partial oxidation of sulphide ore of copper by roasting followed by self-reduction produces blister copper. d) In cyanide process, zinc powder is utilized to precipitate gold from Na[Au(CN)2].
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The correct statement(s) related to the metal extraction processes is/...
(1) PbS + 2PbO  3Pb + SO2 
So, option (1) is correct.
(2) In the extraction of Cu from copper pyrite (CuFeS2)SiO2 is added to remove FeO as slag FeSiO3.
So, option (2) is wrong.

So, option (3) is correct.
(4) Zn + 2Na[Au(CN)2 Na2[Zn(CN)4] + 2Au 
So, option (4) is correct.
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The correct statement(s) related to the metal extraction processes is/are:a)A mixture of PbS and PbO undergoes self-reduction to produce Pb and SO2.b)In the extraction process of copper from copper pyrites, silica is added to produce copper silicate.c)Partial oxidation of sulphide ore of copper by roasting followed by self-reduction produces blister copper.d)In cyanide process, zinc powder is utilized to precipitate gold from Na[Au(CN)2].Correct answer is option 'A,C,D'. Can you explain this answer?
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