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Which of the following statements are co...

Which of the following statements are correct?

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 furance has blistered appearace due to evolution of `SO_(2)` during the extraction.

D

Zinc can be extracted by self-reduction

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