Here's why:

* Reaction: Copper oxide reacts with dilute sulfuric acid (H₂SO₄) to form copper sulfate (CuSO₄) and water (H₂O).

* CuO (s) + H₂SO₄ (aq) → CuSO₄ (aq) + H₂O (l)

* Insolubility: Copper oxide is insoluble in water, making it ideal for this reaction. The reaction proceeds because the formation of soluble copper sulfate drives the reaction forward.

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