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

1. obtain highly pure water
2. set up a potential difference across the two electrodes
3. produce thermal energy
4. desorb oxygen that is adsorbed on the electrode surfaces

Correct answer: set up a potential difference across the two electrodes

Solution

The oxidation of hydrogen in a fuel cell generates electrons, which flow through an external circuit, creating a potential difference between the electrodes. This flow of electrons is what produces electrical energy.

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