AP Chemistryhardmcq1 pt
Which reaction represents the cathode half-reaction in the hydrogen fuel cell?
A.O₂ + 4H⁺ + 4e⁻ → 2H₂O
B.H₂ → 2H⁺ + 2e⁻
C.2H₂O → O₂ + 4H⁺ + 4e⁻
D.2H⁺ + 2e⁻ → H₂
Explanation
Core Concept
At the cathode, oxygen is reduced, gaining electrons with protons to make water. The anode instead oxidizes H₂.
Correct Answer
AO₂ + 4H⁺ + 4e⁻ → 2H₂O
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