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JEE Advanced2014ChemistryGeneral Principles and Processes of Isolation of MetalsActual

Upon heating with C u 2 S , the reagent(s) that give copper metal is/are

Options

  1. AC u F e S 2
  2. BCuO
  3. CC u 2 O
  4. DC u S O 4

Correct answer

B. CuO

Step-by-step solution

A] 2 C u F e S 2 + O 2 → ∆ C u 2 S + 2 F e S + S O 2 B] 4 C u O → 1100 o C 2 C u 2 O + O 2 2 C u 2 O + C u 2 S → ∆ 6 C u + S O 2 C] C u 2 S + 2 C u 2 O → ∆ 6 C u + S O 2 D] C u S O 4 → 720 o C C u O + S O 2 + 1 2 O 2 4 C u O → 1100 o C 2 C u 2 O + O 2 2 C u 2 O + C u 2 S → ∆ 6 C u + S O 2

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