and 
.
(c) The
solidified copper obtained from reverberatory furnace has blistered appearance
due to evolution of 
during the extraction.
(d) Zinc can be
extracted by self-reduction.
Answer:
(a, c)
Correct statements
are
(i) A
depressant prevents certain type of particle to. come to the froth, e.g., 
is added as a depressant during
separation of 
and 
.
(ii) The
solidified copper obtained from reverberatory furnace has blistered appearance due
to evolution of 
during the extraction.
(b) and (d)
are incorrect statements, and can be correctly stated as
(iii) Copper
matte contains 
and 
.
(iv) Zinc can be
extracted by reduction of 
with carbon.
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