A Black Precipitate of Copper Sulfide, CuS, Is Formed When

A black precipitate of copper sulfide, CuS, is formed when a solution of Cu(II) chloride, CuCl₂, is added to a solution of potassium sulfide, K₂S. Which of the following is the net ionic equation for this reaction?

A) CuCl₂(aq) + K₂S(aq) → CuS(s) + 2KCl(aq)
B) Cu²⁺(aq) + Cl₂^2-(aq) + K₂²⁺(aq) + S^2-(aq) → CuS(s) + K₂²⁺(aq) + Cl₂^2-(aq)
C) Cu²⁺(aq) + 2Cl^-(aq) + 2K⁺(aq) + S^2-(aq) → CuS(s) + 2K⁺(aq) + 2Cl^- (aq)
D) Cu²⁺(aq) + S^2-(aq) → CuS(s)

Correct Answer:

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