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BITSAT2017ChemistryGeneral Principles and Processes of Isolation of MetalsActual

Which of the following metal is leached by cyanide process

Options

  1. AAg
  2. BNa
  3. CAl
  4. DCu

Correct answer

A. Ag

Step-by-step solution

Cyanide process, which is also known as MacArthur cyanide process involves the extraction of gold and silver from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide. The leaching is carried out in the presence of air or oxygen to oxidise the metal. Ag is leached by cyanide process by making the complex using NaCN / KCN as follows Ag 2 S + 4 NaCN ⟶ 2 Na Ag ( CN ) 2 Soluble + Na 2 S

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