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NEET2007ChemistryGeneral Principles and Processes of Isolation of MetalsActual

Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching?

Options

  1. AGalena
  2. BCopper pyrite
  3. CSphalerite
  4. DArgentite

Correct answer

D. Argentite

Step-by-step solution

Argentitie or Silver glance, Ag ₂ ~S is an ore of silver. Silver is extracted from argentite by the mac-Arthur and Forest process (leaching process). aligned & Ag ₂ ~S +4 NaCN 2 Na [ Ag ( CN )₂ ]+ Na ₂ ~S & 4 Au +8 KCN +2 H ₂ O + O ₂ 4 ~K [ Au ( CN )₂ ]+4 KOH aligned Related Theory Leaching is the selective dissolution of the desired mineral leaving behind the impurities in a suitable dissolving agent.

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