Which one of the following ores is best concentration by forth-flotation method?

Malachite

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Cassiterite

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Galena

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Magnetite

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Solution

The correct option is C Galena
Froth floatation method is used to remove gangue from sulphide ores.
Galena (ZnS) is a sulphide ore.
Magnetite $(F e_{3} O_{4})$ is an ore of iron. Malachine $[C u_{2} C O_{3} (O H)_{2}]$ is an ore of copper and cassiterite $(S n O_{2})$ is an ore of tin. Hence, only galena contains sulphide ion, thus it is best concentrated by froth floatation method.

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