In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?
- Zinc
- Gold
- Silver
- Copper
The Correct Option is D
Solution and Explanation
The correct option is(D): Copper
In the extraction of Silver and Gold, NaCN is used to leach the metal.
For ZnS, KCN is used as depressant.
For Gold and silver ⇒ leaching [Cyanide 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