Gold is extracted by hydrometallurgical process, based on its property
- of being electropositive
- of being less reactive
- to form complexes which are water soluble
- to form salts which are water soluble
The Correct Option is C
Solution and Explanation
$4 Au +8 KCN +2 H _{2} O + \underset{\text{Air}}{{O _{2}}} \rightarrow 4 K \left[ Au ( CN )_{2}\right]$
Air $+4 KOH$
$2 K \left[ Au ( CN )_{2}\right]+ Zn \rightarrow 2 Au + K _{2}\left[ Zn ( CN )_{4}\right]$
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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