A) Magnetic method
B) Froth floating method
C) Chemical method
D) None of these
Correct Answer: B
Solution :All sulphide ores are concentrated by froth floatation method. In it finely powdered ore, water and pine oil or fatty acids, etc., are mixed in a big tank and agitated. Sulphide ores are wetted by oil particles and are carried to the surface in the form of foam. The gangue material which is preferentially wetted by water settles to the bottom. Hence, the correct option is [b].
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