A) copper (I) sulphide (\[\text{C}{{\text{u}}_{\text{2}}}\text{S}\])
B) sulphur dioxide (\[\text{C}{{\text{O}}_{\text{2}}}\])
C) iron sulphide (FeS)
D) carbon monoxide (CO)
Correct Answer: A
Solution :
[a] In the extraction of copper from its sulphide ore, when ore is subjected to roasting, some of it is oxidised to\[C{{u}_{2}}O\] which reacts with the remaining \[C{{u}_{2}}S\] (sulphide ore) to give copper metal.\[C{{u}_{2}}S+2C{{u}_{2}}O\xrightarrow[{}]{{}}6Cu+S{{O}_{2}}\uparrow \]In this process \[C{{u}_{2}}S\] behaves as reducing agent.
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