In the equation,4M + 8CN^{-} + 2H_2O + O_2 to | vedclass

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(C) The given equation represents the leaching process of noble metals like $Au$ (gold) or $Ag$ (silver) using a dilute solution of sodium cyanide $(N

Vedclass · Accepted Answer

gold

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(C) The given equation represents the leaching process of noble metals like $Au$ (gold) or $Ag$ (silver) using a dilute solution of sodium cyanide $(NaCN)$ in the presence of air $(O_2)$ as an oxidizing agent.This is a key step in the MacArthur-Forrest cyanide process for the extraction of gold and silver from their ores.Therefore,the metal $M$ is $Au$ (gold) or $Ag$ (silver).

In the equation,$4M + 8CN^{-} + 2H_2O + O_2 \to 4[M(CN)_2]^- + 4OH^{-}$,the metal $M$ is

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