The idea of the froth floatation method came from a person $X$ and this method is related to the process $Y$ of ores. $X$ and $Y$,respectively,are

An ore containing the impurity of $FeCr_2O_4$ is concentrated by

Observe the following statements regarding the purification of bauxite and select the correct answer.
$(I)$ During the $Hall$ process,silicon is removed in the form of vapor.
$(II)$ Bauxite containing $Fe_2O_3$ impurities is purified by the $Bayer$ process.
$(III)$ $AlN$ is formed during the $Serpeck$ process.

Reagent used in Bayer's process of concentration of bauxite ore is:

Which one of the following ores is best concentrated by froth floatation method?

In the froth-floatation process,palm oil functions as: