Which equation represents neutralization of a strong acid by a strong base at the net ionic level?

A) H₃O⁺ + OH⁻ → 2H₂O

B) Na⁺ + Cl⁻ → NaCl(s)

C) H₂ + O₂ → H₂O₂

D) CO₂ → C + O₂

Answer: A

Explanation: Hydronium and hydroxide combine to form water. Spectator ions are omitted from the net ionic equation.

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