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Which one of the following is a redox reaction?

Which one of the following is a redox reaction?
2Na(g) + Cl2(g) --> 2NaCl(s)
Ba2+(aq) + SO42-(aq) --> BaSO4(s)
K2Cr2O7(aq) + 2KOH(aq) --> 2K2CrO4(aq) + H2O(l)
Na2CO3(s) + 2HCl(aq) --> 2NaCl(aq) + CO2(g) + H2O(l)
H2O(l) --> H+(aq) + OH-(aq)



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