question_answer 49)

    In the froth floatation process, zinc sulphide and lead sulphide can be separated by............... (a) using collectors                     (b) adjusting the proportion of oil to water (c) using depressant                   (d) using froth stabilisers

Answer:

                    (b, c) Froth floatation method is used to extract metal from sulphide ore.  and  can be separated by using depressant and adjusting the proportion of oil to water. Depressant used for this purpose is. It selectively prevents  from coming to the froth. Hence, (b) and (c) are correct choices.