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COMEDK2020ChemistryGeneral Principles and Processes of Isolation of Metals

During the extraction of gold the following reactions take place aligned & Au + CN ⁻+ H ₂ O O 2 [X] & [X]+ Zn [Y]+ Au aligned X and Y are respectively

Options

  1. A[ Au ( CN )₂ ]⁻ and [ Zn ( CN )₄ ]²⁻
  2. B[ Au ( CN )₄ ]³⁻ and [ Zn ( CN )₄ ]²⁻
  3. C[ Au ( CN )₄ ]²⁻ and [ Zn ( CN )₄ ]²⁻
  4. D[ Au ( CN )₂ ]⁻ and [ Zn ( CN )₆ ]⁴⁻

Correct answer

A. [ Au ( CN )₂ ]⁻ and [ Zn ( CN )₄ ]²⁻

Step-by-step solution

During the extraction of gold, following reactions 2 [ Au ( CN )₂ ]⁻+ Zs (s) [ Zn ( CN )₄ ]²⁻(u q)+2 Au ( s )(X) ( ) Pure gold One chlorine molecule contains 2 chlorine atoms and one HCl molecule contains l chlorine atom.

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