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Q.

Amongst the following, how many ores can be concentrated by froth floatation process:
Galena, sphalerite, cassiterite, calamine, chalcocite, haematite, argentite

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answer is 3.

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Detailed Solution

Galena (PbS), sphalerite (Zn, Fe)S, chalcocite(Cu2S). Although argentite (Ag2S) is a sulphide ore, it is not concentrated by froth flotation process since its silver content is low. It is better concentrated by leaching with NaCN.

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Amongst the following, how many ores can be concentrated by froth floatation process:Galena, sphalerite, cassiterite, calamine, chalcocite, haematite, argentite