$A$ substance which reacts with gangue to form fusible material is called:

Difference in density is the basis of

Which substance is used as a froth stabilizer in the froth flotation process?

The ore that is concentrated by froth floatation process is

The function of potassium ethyl xanthate in the froth floatation process is to make the ore

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.