Froth flotation process is used for the concentration of:

The purification of alumina is called

In the froth floatation process for the concentration of ores,the ore particles float because:

Which one of the following statements is true about the froth flotation method?

Wolframite ore is separated from tinstone $(SnO_2)$ by which of the following processes?

Given below are two statements :-
Statement $I$: In froth floatation method,a rotating paddle agitates the mixture to draw air into it.
Statement $II$: Iron pyrites are generally avoided for the extraction of iron due to environmental reasons.
In the light of the above statements,choose the correct answer from the options given below :-