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 insoluble in pine oil, fatty acid etc

Pure ore is lighter than water

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

answer is D.

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Detailed Solution

Froth-flotation is a physical method for separating minerals(Sulphide ore) from the gangue.

So ,the Froth-flotation method is successful in separating impurities from ores because Pure ore is not as easily wetted by water as by pine oil, fatty acid etc.

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