1.

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?

Answer»

Galena
Copper pyrite
Sphalerite
Argentite

Solution :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 argentitc by the mac-Arthur and Forest process (leaching process).
`Ag_(2)S+4NaCN to 2Na[Ag(CN)_(2)]+Na_(2)S`
`4 Au+8 KCN+2H_(2)O+O_(2) to 4K[Au (CN)_(2)]+4KOH`


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