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NEET levelSingle correct optionDifficulty 1 of 3mt003

Froth flotation is the most suitable method for concentrating

Ahaematite, because it is much denser than silica
Ba sulphide ore such as galena, $PbS$
Ccassiterite containing magnetic impurities
Dbauxite, because it dissolves in alkali

Answer: B

Sulphide ores are preferentially wetted by oil (collector) and are carried to the surface in the froth, while gangue is wetted by water. Oxide ores such as haematite are concentrated by gravity separation, cassiterite by magnetic separation and bauxite by leaching.

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