Out of the following statements identify the incorrect one
(a) During benefaction of an ore by hydraulic washing, lighter gangue particles are washed away leaving ore particles
(b) Pure Al2O3 cannot be obtained by the process of leaching bauxite ore with cone, solution of sodium hydroxide
(c) During froth floatation process, ore particles are removed as froth leaving behind gangue
(d) Suphide ores can be successfully separated using froth floatation process by varying oil-to-water ratio
