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JEE Advanced · 2008 · 13 Apr 2008 · Paper 1 · General Principles and Processes of Isolation of Metals

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Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of
  1. (A)nitrogen
  2. (B)oxygen✓ Correct
  3. (C)carbon dioxide
  4. (D)argon

Answer: (B)

Solution

Silver dissolves in a dilute aqueous solution of NaCN in the presence of oxygen (air) to form a water-soluble complex, sodium argentocyanide:



Oxygen acts as an oxidizing agent, converting metallic silver to , which then forms the complex with cyanide ions.

JEE Advanced · 2008 · 13 Apr 2008 · Paper 1 · Single correct option

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