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In the extraction of copper which of the...

In the extraction of copper which of the following compound is used in slag formation?
a) `Al_2O_3` b) `NiO` c) `CaO` d) `ZnO` e) `SiO_2`

A

only A,C and E

B

only A,D and E

C

only E

D

only A and D

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