Recall that change in oxidation number is the indication of a redox reaction.
Classify each of the following as a redox reaction or a non-redox reaction.
Zn + CuCl2 → ZnCl2 + Cu
SO3 + H2O → H2SO4
HCl + NaOH → H2O + NaCl
2CO + O2 → 2CO2
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