Which of the following reactions is not an oxidation-reduction reaction?
A) 2 Na + H2O → 2 NaOH + H2
B) Mg + 2 HCl → MgCl2 + H2
C) CH4 + 2 O2 → CO2 + 2 H2O
D) CaO + CO2 → CaCO3
Correct Answer:
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