NEET levelSingle correct optionDifficulty 1 of 3mt114
Froth flotation is mainly employed for the concentration of
Aoxide ores such as haematite, which are much denser than the gangue
Bsulphide ores such as ZnS and PbS
Cores whose gangue is magnetic
Dnative gold present as heavy particles in sand
Answer: B
Sulphide ores are preferentially wetted by oil (pine oil) while the gangue is wetted by water, so the ore particles rise with the froth. Haematite is concentrated by gravity or magnetic methods and native gold by gravity washing.