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(D) The process of self-reduction (or auto-reduction) is used in the extraction of copper from its sulfide ores.$1. \ Cu_2S + 2 Cu_2O \longrightarrow

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$(B, C, D)$

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(D) The process of self-reduction (or auto-reduction) is used in the extraction of copper from its sulfide ores.$1. \ Cu_2S + 2 Cu_2O \longrightarrow 6 Cu + SO_2$$2. \ Cu_2S + 2 CuO \longrightarrow 4 Cu + SO_2$$3. \ Cu_2S + CuSO_4 \longrightarrow 3 Cu + 2 SO_2$$CuFeS_2$ (chalcopyrite) is an ore that requires roasting and smelting to produce matte $(Cu_2S + FeS)$,but it does not directly produce copper metal upon simple heating with $Cu_2S$ in the same manner as the oxides or sulfate. Therefore,the reagents that produce copper metal are $CuO$,$Cu_2O$,and $CuSO_4$.

Upon heating with $Cu_2S$,the reagent$(s)$ that give copper metal is/are:
$(A)$ $CuFeS_2$
$(B)$ $CuO$
$(C)$ $Cu_2O$
$(D)$ $CuSO_4$

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Upon heating with $Cu_2S$,the reagent$(s)$ that give copper metal is/are:$(A)$ $CuFeS_2$$(B)$ $CuO$$(C)$ $Cu_2O$$(D)$ $CuSO_4$