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Question
In the froth floatation process for the purification of ores, the ore particles float because ______.
Options
they are light.
their surface is hydrophobic, i.e., not easily wetted by water.
they bear electrostatic charge.
they are insoluble.
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Solution
In the froth floatation process for the purification of ores, the ore particles float because their surface is hydrophobic, i.e., not easily wetted by water.
Explanation:
In the froth flotation process, collectors like ethyl xanthate are added which attach to the mineral particles and make their surfaces hydrophobic (water-repellent). These hydrophobic ore particles then attach to air bubbles and float to the surface as froth, while the hydrophilic impurities remain wetted by water and settle down. Thus, the ore particles float because their surfaces repel water and adhere to the air bubbles in the froth.
