Which reaction is NOT a redox reaction?

1. A. Zn + CuSO4 -> ZnSO4 + Cu
2. B. 2KClO3 + I2 -> 2KIO3 + Cl2
3. C. H2 + Cl2 -> 2HCl
4. D. BaCl2 + Na2SO4 -> BaSO4 + 2NaCl

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