A) their surface is not easily wetted by water
B) they are light
C) they are insoluble
D) they bear electrostatic charge
Correct Answer: A
Solution :
In the froth-floatation process, froths are produced by blowing air through water containing pine-oil and ore. Ore particles are not wetted by water, hence these being lighter, comes out to the surface with froths and extracted. The impurities are wetted by water and becomes heavy. Thus these settle down.
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