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In the metallurgy of copper,metallic copper is finally formed in the furnace by the reactions:
- A$Cu_2S + O_2 \to 2Cu + SO_2$
- B$2CuS + 3O_2 \to 2CuO + 2SO_2$; $2CuO + CuS \to 3Cu + SO_2$
- C$2Cu_2S + 3O_2 \to 2Cu_2O + 2SO_2$; $Cu_2S + 2Cu_2O \to 6Cu + SO_2$
- D$CuS + O_2 \to Cu + SO_2$
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