Which of the following ores is best concentrated by froth floatation?

Siderite

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Galena

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Malachite

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Magnetite

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Solution

The correct option is B Galena
Froth floatation is a surface chemistry based selective concentration process generally applicable for dressing or concentrating sulphide ores. In other words, only the ore particles are wetted by the froth whereas the gangue particles are not. Once wetted, the ore particles rise to the top and they could easily be skimmed off.

From the given ores, only galena - $P b S$ is a sulphide ore.

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