General Principles and Processes of Isolation of Elements
The ore that is concentrated by forth floatation process is:
Correct Answer: Option(a)
Solution: The froth floatation process is used for the concentration of the low-grade sulphide ores. The principal of this process is that gangue and ore particles have a different degree of wettability with water and pine oil.
As cinnabar is HgS, it is concentrated by froth floatation process.
Hence, the correct option is (A).