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Q.

Which of the following statements are incorrect?I. Zinc can be extracted by self-reduction.II. A depressant prevents certain type of particle to come to the froth.III. Copper matte contains ZnS and Cu2S.IV. The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of SO2 during the extraction.    The option containing incorrect statements is

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a

Both I and II

b

Both II and III

c

Both I and III

d

II and IV

answer is C.

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Detailed Solution

Zn can be extracted by electrolytic refining method.Copper matte contains Cu2S and FeS.
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Which of the following statements are incorrect?I. Zinc can be extracted by self-reduction.II. A depressant prevents certain type of particle to come to the froth.III. Copper matte contains ZnS and Cu2S.IV. The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of SO2 during the extraction.    The option containing incorrect statements is