copper can best be purified by

CHEMISTRYWAEC 1989

A. roasting the impure copper in black furnace
B. Heating the oxide with coke
C. electrolyzing a copper (II) salt solution using the impure copper as the anode
D. converting the impure copper to trioxonitrate

Correct Answer: C. electrolyzing a copper (II) salt solution using the impure copper as the anode

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