For Redox reactions, oxidation and reduction both occur in a reaction:
Recall the mnemonics LEO GER.
Which one of the following is not a redox reaction?
A. CaCO3 → CaO + CO2
B. 2 H2 + O2 → 2 H2O
C. Na + H2O → NaOH + 1/2 H2
D. MnCl2 → MnCl2 + 1/2 Cl2
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