Which equation represents an oxidation-reduction reaction? | Electrochemistry

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Question

Which equation represents an oxidation-reduction reaction?

H₂SO₄ + 2NH₃ → (NH₄)₂SO₄

H₂SO₄ + Na₂CO₃ → Na₂SO₄ + H₂O + CO₂

2K₂CrO₄ + H₂SO₄ → K₂Cr₂O₇ + K₂SO₄ + H₂O

2H₂SO₄ + Cu → CuSO₄ + 2H₂O + SO₂

✓ Correct

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