alleryHydrogen-Oxygen fuel cell produces:
ANaOH
BWater (and electrical energy from 2H₂ + O₂ → 2H₂O)
CCO₂
DCH₄
Answer & Solution
Correct answer: B. Water (and electrical energy from 2H₂ + O₂ → 2H₂O)
**Anode:** 2H₂ + 4OH⁻ → 4H₂O + 4e⁻.
**Cathode:** O₂ + 2H₂O + 4e⁻ → 4OH⁻. Net: 2H₂ + O₂ → 2H₂O.
Theoretical E° ≈ 1.23 V. Used in space missions, electric vehicles. Only byproduct: water.
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