JEE Main 2002 Chemistry question

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

Not in JEE Main or NEET syllabus

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