Question

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

Answer 1

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 $\left(PbS\right)$ hence it can be concentrated by froth floatation process. Fluorspar​ is a halide ore $Ca{F}_2$, Anglesite​ is a sulphate ore and pitchblende​ is an oxide ore $\left(U_3{O}_8\right)$. Hence, these cannot be concentrated by this process.
Hence, (a) is the correct option.