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JEE Main202325 Jan 2023Morning ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

Which one of the following reactions does not occur during extraction of copper ?

Options

  1. A2 Cu 2   S + 3 O 2 → 2 Cu 2 O + 2 SO 2
  2. B2 FeS + 3 O 2 → 2 FeO + 2 SO 2
  3. CCaO + SiO 2 → CaSiO 3
  4. DFeO + SiO 2 → FeSiO 3

Correct answer

C. CaO + SiO 2 → CaSiO 3

Step-by-step solution

The following changes occur during smelting. (a) Most of the ferrous sulphide gets oxidised to ferrous oxide which combines with silica (flux) to form fusible slag. 2 FeS   +   3 O 2   →   2 FeO   +   2 SO 2 FeO   +   SiO 2   →   FeSiO 3 (Ferrous silicate) The slag being lighter floats and forms the upper layer. It is removed through the slag hole from time to time. (b) During roasting or in the blast furnace if any oxide of copper is formed, it combines

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