Which of the following statements are correct ?

Options

A. A depressant prevents certain type of particle to come to the froth.
B. Copper matte contains `Cu_(2)S` and `ZnS`
C. The solidified copper obtained from reverberatory furnance has blistered appearance due to evolution of `SO_(2)` during the extraction.
D. Zinc can be extracted by self-reduction.

Answer

A, C

Explanation

(a,c) Correct statement are
(i) A depressant prevents certain type of particle to come to the forth. e.g., NaCN is added as depressant during seperation of PbS and ZnS
(ii) The solidified copper obtained from reverberatory furnance has blistered appearance due to evolution of `SO_(2)` during the extractio.
(b) and (d) are incorrect statements, and can be correctly stated as
(iii) Copper matte contains `Cu_(2)S` and FeS.
(iv) Zinc can be extracted by reduction of ZnO with carbon.