A) they are light
B) these are insoluble
C) their surface do not wet with water easily
D) these contain electric charge
Correct Answer: C
Solution :
Froth floatation process uses for the concentration of sulphide ores. In this method ore particles are preferentially wetted by oil and rise to the surface in the form of a froth from where these are skimmed off. The silicious and earthy impurities are wetted by water and sink to the bottom of the tank.
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