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JEE Advanced2023ChemistryGeneral Principles and Processes of Isolation of MetalsActual

The correct statement(s) related to processes involved in the extraction of metals is(are)

Options

  1. ARoasting of Malachite produces Cuprite
  2. BCalcination of Calamine produces Zincite
  3. CCopper pyrites is heated with silica in a reverberatory furnace to remove iron
  4. DImpure silver is treated with aqueous KCN in the presence of oxygen followed by reduction with zinc metal

Correct answer

B. Calcination of Calamine produces Zincite

Step-by-step solution

The ore Calamine contain ZnCO 3 . The Calamine on heating produces ZnO . ZnCO 3 → ∆ ZnO + CO 2 Cyanide process, also called Macarthur-forrest Process, method of extracting silver from impure ores by dissolving them in a dilute solution of sodium cyanide in the presence of oxygen. The complex formed in the above process reduced to silver metal by the treatment with zinc. O 2 + H 2 O + Ag + NaCN → Na Ag CN 2 + NaOH Na Ag CN 2 → Zn Na 2 Zn CN 4 + Ag SiO 2 ​ (Silica) is a flux material. It remov

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