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In a hydrogen–oxygen fuel cell, the oxidation of hydrogen takes place to

1. obtain highly pure water
2. set up a voltage across the two electrodes
3. release thermal energy
4. desorb oxygen that is adsorbed on the electrode surface

Correct answer: set up a voltage across the two electrodes

Solution

In a H2-O2 fuel cell, H2 is oxidized at the anode releasing electrons; this electrochemical reaction sets up a voltage (potential difference) across the two electrodes, which drives current through the external circuit.

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