Which of the following statement(s) is/are incorrect ?
I. Zinc can be extracted by self-reduction.
II. A depressant prevents certain type of particel of come in the froth .
III. Copper matte contains ZnS and ` Cu_2S `.
IV. The solidified copper obtained from reverberatory furnance has blistered appearance due to evolution of `SO_2` during the extraction .
The option containing incorrect statements is

Options

A. I and II
B. II and IV
C. I and IV
D. II and III

Answer

C

Explanation

Copper matte consist of `Cu_2S and FeS`. So, I and III are incorrect .