Question

What is the role of aniline or cresol when added in a froth floatation process?

Answer 1

Froathing agents wets the sulphides particle and with air they form froth and rise to the water surface.
The froth should not break and need to be stabilized for scuuming off. Chemicals added for the stabilization of the froth are called stabilizers.
Aniline and cresols are some examples of stabilizers.
Henceo option (a) is the correct.