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Amongest the following , how many ores c...

Amongest the following , how many ores can be concentrated by froth flotation process :
Galena, sphalerit, cassiterite, calamine, chalcocite, haematite, argentite.

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The correct Answer is:
`(3)`
Galena `(PbS)`, sphalerite `(Zn,Fe)S`, chalococite `(Cu_(2)S)` Althrough argentite `(Ag_(2)S)` 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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