Froth flotation method is used for the concentration of $.......$.

Which principle is involved in magnetic separation?

Which of the following methods is used to separate wolframite and stannic oxide present in cassiterite?

Which of the following substances acts as a collector in the froth floatation method?

How do we separate two sulphide ores by the Froth Flotation Method? Explain with an example.

Select the correct option regarding the method of separating two sulfide ores by the froth flotation process.
$(1)$ The ratio of water and oil is chosen appropriately.
$(2)$ Some depressants are used for this process.
$(3)$ $HCN$ is a depressant for a mixture of $ZnS$ and $PbS$.
$(4)$ By using a suitable depressant for a mixture of $ZnS$ and $PbS$,only $PbS$ comes up with the froth.