Question:
This metal is extracted from its ore by formation of a cyanide complex
This metal is extracted from its ore by formation of a cyanide complex
Updated On: Jun 20, 2022
- Ag
- Cu
- Al
- Zn
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The Correct Option is A
Solution and Explanation
Gold (Au) and silver (Ag) are extracted by treating their ores with dilute NaCN solution in the presence of air. During this process, a cyanide complex is formed which gives pure metal when treated with more electropositive metal like $Z n$.
$4 Ag +8 CN ^{-}+2 H _{2} O + O _{2}$
$\longrightarrow 4\left[ Ag ( CN )_{2}\right]^{-}+4 OH ^{-}$
$2\left[ Ag ( CN )_{2}\right]^{-}+ Zn \longrightarrow\left[ Zn ( CN )_{4}\right]^{2-}+\underset{\text{silver}}{2 Ag}$
This process is called Mac Arthur Forest process.
$4 Ag +8 CN ^{-}+2 H _{2} O + O _{2}$
$\longrightarrow 4\left[ Ag ( CN )_{2}\right]^{-}+4 OH ^{-}$
$2\left[ Ag ( CN )_{2}\right]^{-}+ Zn \longrightarrow\left[ Zn ( CN )_{4}\right]^{2-}+\underset{\text{silver}}{2 Ag}$
This process is called Mac Arthur Forest process.
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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