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QJEEAdv08Ch6dd8: JEE Advanced 2008 Chemistry - Class 12 JEEAdv08Ch6dd8 Solution: Native silver metal forms a water soluble complex with a dilute …

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

Multiple Choice Options

  • A nitrogen
  • B oxygen
  • C carbon dioxide
  • D argon

Step-by-Step Verified Solution

Reaction involving leaching of silver ores is reversible add, so to get the maximum yield of the product the reaction is carried out in presence of oxygen. Also, oxygen oxidises silver which then produces soluble complex with CN −^- ions.

4Ag + 8NaCN + 2H 2_2 O + O 2_2 →\to 4Na[Ag(CN) 2_2 ] + 4NaOH

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