A) Galena
B) Cassiterite
C) Magnetite
D) Malachite
Correct Answer: A
Solution :
Here only Galena is \[PbS\] (a sulphide ore). Cassiterite is \[Sn{{O}_{2}}\] (oxide ore). Magnetite is \[F{{e}_{3}}{{O}_{4}}\] (Oxide ore) and Malachite is \[Cu{{(OH)}_{2}}.CuC{{O}_{3}}\] (Carbonate ore). The froath floatation process is used to concentrate sulphide ores, based on preferential wetting properties with froating agent and water.
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