Which of the following statements are correct?

Question:

Which of the following statements are correct?

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

(ii) Copper matte contains Cu2S and ZnS.

(iii) The solidified copper obtained from the reverberatory furnace has blistered

appearance due to evolution of SO2

during the extraction.

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

Solution:

Option (i) and (iii) are the answers.

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