In the equation: M + 8CN^{-} + 2H_2O + O_2 ri | vedclass

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(D) The given chemical equation represents the MacArthur-Forrest process,which is used for the extraction of noble metals like gold $(Au)$ and silver

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Both $(a)$ and $(b)$

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(D) The given chemical equation represents the MacArthur-Forrest process,which is used for the extraction of noble metals like gold $(Au)$ and silver $(Ag)$ from their ores. The balanced equation for the dissolution of these metals in cyanide solution is: $4M + 8CN^{-} + 2H_2O + O_2 \rightarrow 4[M(CN)_2]^- + 4OH^{-}$ Here,$M$ represents either $Au$ or $Ag$. Therefore,both $(a)$ and $(b)$ are correct.

List-$I$	List-$II$
$A$. Calcination	$1$. Galena
$B$. Roasting	$2$. Magnetite
$C$. Magnetic separation	$3$. Pyrometallurgy
$D$. Carbon reduction of metal oxide	$4$. Malachite

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

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