Question

Which of the following statements are correct?

(i) A depressant prevents certain type of particle to come to the froth.

(ii) Copper matte contains \[\ce{Cu2S}\] and \[\ce{ZnS}\].

(iii) The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of \[\ce{SO2}\] during the extraction.

(iv) Zinc can be extracted by self-reduction.

Answer 1

(i) A depressant prevents certain type of particle to come to the froth.

(iii) The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of \[\ce{SO2}\] during the extraction.

Explanation:

Depressants can prevent frothing of a particular sulphide. The solidified copper obtained in reverberatory furnace has blistered appearance hence it is called blister copper.