Purification And Characterisation Of Organic Compounds Question 157
Question: Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching-
Options:
A) Galena
B) Copper pyrite
C) Sphalerite
D) Argentite
Show Answer
Answer:
Correct Answer: 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_2S $ is an ore of silver.
Silver is extracted from argentite by the mac-Arthur and Forest process (leaching process).
$ Ag_2S+4NaCN\to 2Na[Ag{{(CN)}_2}]+Na_2S $
$ 4Au+8KCN+2H_2O+O_2\to $
$ 4K[Au{{(CN)}_2}]+4KOH $
BETA
