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  4. The cyanide process of gold extraction involves leaching out gold from its ore with CN- in the presence of Q in water to form R. Subsequently, R is treated with T to obtain Au and Z. Choose the correct option(s)

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Q. The cyanide process of gold extraction involves leaching out gold from its ore with $CN^-$ in the presence of $Q$ in water to form $R$. Subsequently, $R$ is treated with $T$ to obtain $Au$ and $Z$. Choose the correct option(s)

JEE AdvancedJEE Advanced 2019General Principles and Processes of Isolation of Elements

Solution:

$4Au(s) + 8CN^{-}(aq) + 2H_2O(aq) +\underset{\text{(Q)}}{O_{2(g)}}\rightarrow 4[Au(CN)_2]^{-}(aq) + 4OH^{-}(aq)$
$\underset{\text{(R)}}{2[Au(CN)_2]^{-}}(aq) +\underset{\text{(T)}}{Zn(s)} \underset{\text{(Z)}}{\rightarrow {[Zn (CN)_4]^{2-}}}(aq) + 2Au(s)$