7. Which of the following reactions does not involve oxidation-reduction?
(A)CH₄ + 2O₂ → 2H₂O + CO₂
(B)Mg + 2HCl → MgCl₂ + H₂
(C)2Na + 2H₂O → 2NaOH + H₂
(D)MnO₂ + 4HCl → Cl₂ + 2H₂O + MnCl₂
(E)NaOH + HBr → H₂O + NaBr

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