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Q.

Froth-flotation method is successful in separating impurities from ores because

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a

Impurities are soluble in water containing additives like pine oil, fatty acid etc 

b

Pure ore is not as easily wetted by water as by pine oil, fatty acid etc

c

Pure ore is insoluble in pine oil, fatty acid etc 

d

Pure ore is lighter than water 

answer is A.

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Detailed Solution

Froth floatation is a physical method of separating, mineral from the gangue that
depends on differences in their wettabilities by a liquid solution. This method is used for the concentration of sulphide ores. The method is based on the preferential wetting properties with the frothing agent and water.

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