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Amongst the following, the total number ...

Amongst the following, the total number of ores which cannot be concentrated by froth floatation process is ............
Haematite, bauxite, galena, copper pyrites, sphalerite, cassiterite, calmine, argentite, chalcocite.

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The correct Answer is:
4
Haematite, bauxite, cassiterite and calamine are not sulphide ores so these cannot be concentrated by froth floatation process.
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