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)
- Q is O$_2$
- T is Zn
- Z is $[Zn(CN)_4]^{2-}$
- R is $[Au(CN)_4]^-$
The Correct Option is C
Solution and Explanation
$\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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Concepts Used:
General Principles and Processes of Isolation of Elements
What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal