A) reduction by carbon
B) electrolysis of ore
C) roasting of ore in\[{{O}_{2}}\]
D) magnetic separation
Correct Answer: D
Solution :
The first step of an extraction process is ore concentration which is done by magnetic separation and froth floatation in the extraction of copper from copper pyrites. Then the ore roasted in\[{{O}_{2}}\]. \[\underset{copper\,pyrite}{\mathop{2CuFe{{S}_{2}}}}\,+{{O}_{2}}\xrightarrow[{}]{{}}C{{u}_{2}}S+2FeS+S{{O}_{2}}\]
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