(C) In the metallurgy of copper,the sulfide ore is first roasted to form $Cu_2O$ and $Cu_2S$. Some $Cu_2O$ reacts with $Cu_2S$ in a process known as s

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(C) In the metallurgy of copper,the sulfide ore is first roasted to form $Cu_2O$ and $Cu_2S$. Some $Cu_2O$ reacts with $Cu_2S$ in a process known as self-reduction (or auto-reduction) to produce copper metal. The chemical reaction is: $2Cu_2O + Cu_2S \rightarrow 6Cu + SO_2$.