$ 4M+8C{{N}^{-}}+2H_2O+O_2\to $ $ 4{{[M{{( CN )}_2}]}^{-}}+4O{{H}^{-}} $ Identify the metalM. It is
A) copper
B) iron
C) gold
D) zinc
Correct Answer: C
This is cyanide process for gold (M = Au).
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