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Question

Which of the following ores is concentrated by froth flotation process?

A
Galena
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B
Fluorspar
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C
Pitchblende​
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D
Anglesite​
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Solution

The correct option is A Galena
Froth floatation method is commonly used for the concentration of the low-grade sulphide ore. The principal is based on the fact that gangue and ore particles have a different degree of wettability with water and pine oil. The ore particles are wetted by oil whereas gangue particles are wetted by water.
Galena is a sulphide ore (PbS) hence it can be concentrated by froth floatation process. Fluorspar​ is a halide ore CaF2, Anglesite​ is a sulphate ore and pitchblende​ is an oxide ore (U3O8). Hence, these cannot be concentrated by this process.
Hence, (a) is the correct option.

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