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NTA Abhyas NEET2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice

From gold aurocyanide N a [ A u ( C N ) 2 ] , gold can be precipitate by adding powder of

Options

  1. AHg
  2. BAg
  3. CZn
  4. DNone of these

Correct answer

C. Zn

Step-by-step solution

This reaction occurs as follows 2 N a [ A u ( C N ) 2 ] + Z n → N a 2 [ Z n ( C N ) 4 ] + 2 A u As zinc is more reactive so it can easily displace gold.

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