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Which of the following statements about froth flotation is/are correct? Select all that apply.

1. It is a physical technique used to separate a mineral from its gangue
2. It works by exploiting differences in surface wettability between the ore and the gangue
3. It is primarily applied to sulphide ores
4. In this process, impurities settle to the bottom while the ore rises

Correct answer: It is primarily applied to sulphide ores

Solution

Froth flotation exploits differential wettability — ore particles attach to air bubbles and rise, while gangue sinks. It is especially effective for sulphide ores because their surfaces are naturally hydrophobic.

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