Upon heating with $C u_{2} S$ , the reagent(s) that give copper metal is/are:

C u F e S_{2}

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C u O

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C u_{2} O

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C u S O_{4}

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Solution

The correct options are
B $C u_{2} O$
C $C u O$
D $C u S O_{4}$
$(A) 2 C u F e S_{2} + O_{2} Δ - \to C u_{2} S + 2 F e S + S O_{2}$

$(B) 4 C u O 1100^{\circ} C - --- \to 2 C u_{2} O + O_{2}$
$2 C u_{2} O + C u_{2} S Δ - \to 6 C u + S O_{2}$

$(C) C u_{2} S + 2 C u_{2} O Δ - \to 6 C u + S O_{2}$

$(D) C u S O_{4} 720^{\circ} C - -- \to C u O + S O_{2} + \frac{1}{2} O_{2}$

$4 C u O 1100^{\circ} C - --- \to 2 C u_{2} O + O_{2}$
$2 C u_{2} O + C u_{2} S Δ - \to 6 C u + S O_{2}$

Hence, options B, C and D are correct.

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