Upon heating with \( \mathrm{Cu}_{2} \mathrm{~S} \), the reagent(s)...

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Upon heating with \( \mathrm{Cu}_{2} \mathrm{~S} \), the reagent(s) that give copper metal is/are
[JEE Advanced-2014]
\( \mathrm{P} \)
(A) \( \mathrm{CuFeS}_{2} \)
(B) \( \mathrm{CuO} \)
(C) \( \mathrm{Cu}_{2} \mathrm{O} \)
(D) \( \mathrm{CuSO}_{4} \)
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