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Question

Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of 
(IIT-JEE, 2008)
  1. Nitrogen
  2. Oxygen
  3. Carbon dioxide 
  4. Argon


Solution

The correct option is B Oxygen
Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of oxygen as follows. 
4Ag+8NaCN+2H2O+O24Na[Ag(CN)2]+4NaOH

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