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JEE Main202227 Jun 2022Evening ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

Statement I: Leaching of gold with cyanide ion in absence of air / O 2 leads to cyano complex of Au (III). Statement II: Zinc is oxidized during the displacement reaction carried out for gold extraction. In the light of the above statements, choose the correct answer from the options given below.

Options

  1. ABoth Statement 1 and statement 2 are correct
  2. BBoth Statement 1 and statement 2 are incorrect
  3. CStatement 1 is correct but statement 2 is incorrect
  4. DStatement 1 is incorrect but statement 2 is correct

Correct answer

D. Statement 1 is incorrect but statement 2 is correct

Step-by-step solution

4   Au s + 8 CN - aq + 2 H 2 O aq + O 2 g → 4 Au CN 2 - aq + 4 OH - aq The oxidation state of gold in the complex is +1. 2 Au CN 2 - aq + Zn s → 2 Au s + Zn CN 4 2 - aq The oxidation state of zinc in the complex is +2. Oxidation state of Zn in Zn CN 4 2 - +2. As, Oxidation state of zinc is converted from zero(elemental state) to +2.It is undergoing oxidation. Hence,Statement 1 is incorrect but statement 2 is correct

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