Question:
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)
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)
Updated On: Jun 14, 2022
- Q is O$_2$
- T is Zn
- Z is $[Zn(CN)_4]^{2-}$
- R is $[Au(CN)_4]^-$
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The Correct Option is C
Solution and Explanation
${4Au(s) + 8CN^{-}(aq) + 2H2O(aq) +}$$\underset{\text{(Q)}}{{O2(g)}}$${->4[Au(CN)2]^{-}(aq) + 4OH^{-}(aq)}$
$\underset{\text{(R)}}{{2[Au(CN)2]^{-}}}$${(aq) +}$$\underset{\text{(T)}}{{Zn(s)}}$$\underset{\text{(Z)}}{{{->}{[Zn (CN)4]^{2-}}}}$${(aq) + 2Au(s)}$
$\underset{\text{(R)}}{{2[Au(CN)2]^{-}}}$${(aq) +}$$\underset{\text{(T)}}{{Zn(s)}}$$\underset{\text{(Z)}}{{{->}{[Zn (CN)4]^{2-}}}}$${(aq) + 2Au(s)}$
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Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
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