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JEE Advanced2008ChemistryGeneral Principles and Processes of Isolation of MetalsActual

Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of

Options

  1. Anitrogen
  2. Boxygen
  3. Ccarbon dioxide
  4. Dargon

Correct answer

B. oxygen

Step-by-step solution

A water soluble complex of silver with a dilute aqueous solution of NaCN is sodium argentocyanide. In the cyanide process, the native form is crushed and treated with 0.1-0.2 % solution of NaCN and aerated. 4 Ag +8 NaCN +2 H ₂ O + O ₂ 4 Na [ Ag ( CN )₂ ]+4 NaOH Argentocyanide is soluble. Further, metals are recovered from the complex by reduction with zinc

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