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

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

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

Pure ore is insoluble in pine oil, fatty acid etc

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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