Description : What is a depressant? Give one example.
Last Answer : Ans. Compounds which prevent the formation of froth in froth flotation process are called depressants. For example, NaCN can be used as a depressant for ZnS in the separation of ZnS from PbS ore. It forms a ... complex, Na2[Zn(CN)4] on the surface of ZnS and thus prevents it from forming the froth.