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NTA Abhyas NEET2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice

Extraction of gold and silver involves leaching with C N - ion. Silver is later recovered by:

Options

  1. ALiquation
  2. BDistillation
  3. CZone refining
  4. DDisplacement with Zn

Correct answer

D. Displacement with Zn

Step-by-step solution

Zn being more reactive than Ag and Au, displaces them. From Native ore, 4 Ag + 8 NaCN + 2 H 2 O + O 2 → Leaching 4 Na Ag CN 2 + 4 NaOH Soluble Sodium dicyanoargentate (I) 2 Na Ag CN 2 + Zn → Displacement Na 2 Zn CN 4 + 2 Ag ↓

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