A) Copper (I) sulphide\[(C{{u}_{2}}S)\]
B) Carbon monoxide (CO)
C) Iron sulphide (FeS)
D) Sulphur dioxide\[(S{{O}_{2}})\]
Correct Answer: A
Solution :
It involves auto-reduction; \[2C{{u}_{2}}O+C{{u}_{2}}S\to 6Cu+S{{O}_{2}}\]
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