JEE Main 2022 Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main 2022

Statement-I : Leaching of gold with cyanide ion in absence of 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.

(1)Both statement-I and statement-II are correct
(2)Both statement-I and statement-II are incorrect
(3)Statement-I is correct but statement-II is incorrect
(4)Statement-I is incorrect but statement-II is correctCorrect

Answer: (4)

Solution

Leaching of gold with cyanide takes place in the presence of and gives the cyano complex in which gold is in the +1 state: 8CN^{-}2H_{2}OO_{2}$ →

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Question ID VK-034478