General Principles And Processes Of Isolation Of Elements Ques 6
6. Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offer an exception and concentrated by chemical leaching?
[2007]
(a) Galena
(b) Copper pyrite
(c) Sphalerite
(d) Argentite
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Answer:
Correct Answer: 6.(d)
Solution:
- (d) Leaching is the selective dissolution of the desired mineral leaving behind the impurities in a suitable dissolving agent, e.g. Argentitie or Silver glance, $Ag_2 S$ is an ore of silver. Silver is extracted from argentite by the mac-Arthur and Forest process (leaching process).
$Ag_2 S+4 NaCN \to 2 Na[Ag(CN)_2]+Na_2 S$
BETA
