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Which one of the following ores is best concentrated by froth flotation method:A. GalenaB. CassiteriteC. MagnetiteD. Malachite

Answer» Correct Answer - A
Here only Galena is `PbS` (a sulphide ore).
Cassiterite is `SnO_(2)`(oxide ore). Magnetic is `Fe_(3)O_(4)`(oxide ore) and Malachite is `Cu(OH)_(2).CuCO_(3)`(carbonate ore). The froth floatation process is used to concentrate sulphide ores, based on preferntial wetting properties with frothing agent and water.


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