The ore which is concentrated by wetting with oil is:

The ore that is concentrated by the froth floatation process is

Name the reagent that is used in leaching of gold.

Which of the following ores can be concentrated by the froth flotation method?

In the extraction of $Al$,the chemical used in the $Serpek$ process during leaching is:

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 :-