The beneficiation of the sulphide ores is usually done by

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

Wolframite ore is separated from tinstone ore by the process of

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 :-

Which of the following ores is concentrated by the process of leaching?

Leaching is commercially carried out for the concentration of which of the following ores?