The cyanide process of gold extraction involves leaching out gold from its ore with $\mathrm{CN}^{-}$in the presence of $\mathbf{Q}$ in water to form $\mathbf{R}$. Subsequently, $\mathbf{R}$ is treated with $\mathbf{T}$ to obtain Au and $\mathbf{Z}$. Choose the correct option(s).
Select ALL correct options:
A
$\mathbf{T}$ is Zn
B
$\mathbf{R}$ is $\left[\mathrm{Au}(\mathrm{CN})_4\right]^{-}$
C
$\mathbf{Z}$ is $\left[\mathrm{Zn}(\mathrm{CN})_4\right]^{2-}$
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