A) Copper (I) sulphide \[(C{{u}_{2}}S)\]
B) Sulphur dioxide \[\left( S{{O}_{2}} \right)\]
C) Iron sulphide \[\left( FeS \right)\]
D) Carbon monoxide (CO)
Correct Answer: A
Solution :
Cuprous oxide formed during roasting of cuprous sulphide is mixed with few amount of cuprous sulphide and heated in a reverberatory furnace to get metallic copper. \[2C{{u}_{2}}O+C{{u}_{2}}S\to 6Cu+S{{O}_{2}}\]
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