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Which one of the following is a redox reaction?

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A. 2Na(g) + Cl2(g) → 2NaCl(s)
B. K2Cr2O7(aq) + 2KOH(aq) → 2K2CrO4(aq) + H2O(l)
C. Ba2+(aq) + SO42-(aq) → BaSO4(s)
D. H2O(l) → H+(aq) + OH-(aq)
E. Na2CO3(s) + 2HCl(aq) → 2NaCl(aq) + CO2(g) + H2O(l)

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