Which reaction is NOT a redox reaction?

Options

1. H₂ + Cl₂ → 2HCl
2. BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl
3. Zn + CuSO₄ → ZnSO₄ + Cu
4. Fe + S → FeS

Correct Answer

BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

Explanation

In this reaction, there is no change in oxidation numbers. It is a double displacement (precipitation) reaction, not redox.

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