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Question

Any physical and chemical process by which low grade ores are concentrated, is __________.
  1. froth flotation
  2. washing in zigs
  3. crushing and then screening
  4. hand picking

A
crushing and then screening
B
washing in zigs
C
froth flotation
D
hand picking
Solution
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Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic. Any physical and chemical process by which low grade ores are concentrated is called froth flotation.

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