JEE Main 2022 Chemistry question

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

In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?

(1)Zinc
(2)Gold
(3)Silver
(4)CopperCorrect

Answer: (4)

Solution

In the extraction of silver and gold the metal is leached with NaCN: 4Au + 8CN^{-} + 2H_{2}O + O_{2} \to 4[Au(CN)_{2}]^{-} + 4OH^{-}, followed by displacement with zinc:

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Question ID VK-035292