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JEE Advanced2012ChemistryGeneral Principles and Processes of Isolation of MetalsActual

In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are

Options

  1. AO ₂ and CO respectively
  2. BO ₂ and Zn dust respectively
  3. CHNO ₃ and Zn dust respectively
  4. DHNO ₃ and CO respectively

Correct answer

B. O ₂ and Zn dust respectively

Step-by-step solution

The reactions involved in cyanide extraction process are: (argentite) Ag ₂ ~S +4 NaCN 2 Na [ Ag ( CN )₂ ]+ Na ₂ ~S 4 Na ₂ ~S + Oxiding agent 5 O ₂ +2 H ₂ O 2 Na ₂ SO ₄+4 NaOH +2 ~S 2 Na [ Ag ( CN )₂ ]+ array c (reducing agent) array Zn Na ₂ [ Zn ( CN )₄ ]+2 Ag

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