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Question

In the Mac. Arthur process of extraction

JEE Advanced Question Paper 2019 Chemistry Paper 2 Solution 7


  1. R is [Au(CN4)]

  2. Z is [Zn(CN)4]2-

  3. Q is O2

  4. Y is Zn

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Solution

The correct option is D

Y is Zn


The explanation for the correct answer.

  • Au leached withinNaCNin the presence of air when gold and its salt are converted to soluble complex.
  • 4Au+8NaCN+O2+2H2O4NaAuCN2+4NaOH
  • Zinc dust is then added to the precipitateAu.
  • 2Na[Au(CN2)]+ZnNa2[Zn(CN)4]2-+2Au
  • Au react with NaCN and O2 to form [Au(CN4)] which further react with Zn to form[Zn(CN)4]2-.

Hence the correct options are (B), (C), and (D).


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