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AP EAMCET2013ChemistryGeneral Principles and Processes of Isolation of Metals

Which of the following is not added during the extraction of silver by cyanide process?

Options

  1. ANaCN
  2. BAir
  3. CZn
  4. DNa ₂ ~S ₂ O ₃

Correct answer

D. Na ₂ ~S ₂ O ₃

Step-by-step solution

In the extraction of silver from cyanide process (also Mac-Arthur Forrest process), the siliver compound dissolve in NaCN solution forming a soluble complex salt, in presence of air, then silver is precipitated from this complex salt by the addition of Zn , because Zn being more reactive displaces the Ag. aligned Ag ₂ ~S +4 NaCN & 2 Na [ Ag ( CN )₂ ]+ Na ₂ ~S Na ₂ ~S +2 O ₂ & Na ₂ SO ₄ 2 Na [ Ag ( CN )₂ ]+ Zn & Na ₂ [ Zn ( CN )₄ ]+2 Ag aligned

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