In a $H_{2} - O_{2}$ fuel cell, combustion of hydrogen occurs to

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remove adsorbed oxygen from electrode surface

create potential difference between the two electrodes

produce high purity water

generate heat

answer is B.

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Detailed Solution

Combustion of hydrogen occurs in $H_{2} - O_{2}$ fuel cell because of the difference in potential between two electrodes. So on one electrode oxidation occur while on another reduction.

Hence, the correct option is B) create potential difference between the two electrodes.

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