JEE Main 2002 Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main 2002

Cyanide process is used for the extraction of

(1)barium
(2)aluminium
(3)boron
(4)silverCorrect

Answer: (4)

Solution

The cyanide (MacArthur–Forrest) process leaches silver or gold from their ores as soluble cyano complexes, 4Ag + 8CN^- + 2H_2O + O_2 \to 4[Ag(CN)_2]^- + 4OH^-, followed by

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Question ID VK-037964