The overall reaction of a hydrogen-oxygen fuel cell is:
2H2(g)+O2(g)→2H2O(l)
2H2(g)+4OH−(aq)→4H2O(l)+4e−
O2(g)+2H2O(l)+4e−→4OH−(aq)
4OH−(aq)+4e−→2H2O(l)
A
2H2(g)+O2(g)→2H2O(l)
B
O2(g)+2H2O(l)+4e−→4OH−(aq)
C
2H2(g)+4OH−(aq)→4H2O(l)+4e−
D
4OH−(aq)+4e−→2H2O(l)
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Solution
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A fuel cell is an electrochemical cell that converts the chemical energy from a fuel into electricity through an electrochemical reaction of hydrogen fuelwith oxygen or anotheroxidizing agent.
The reactions which takes place in hydrogen-oxygen fuel cell are,
At cathode:2H2(g)+4OH−(aq)→4H2O(l)+4e−
At cathode:O2(g)+2H2O(l)+4e−→4OH−(aq)
Overall reaction: 2H2(g)+O2(g)→2H2O(l)
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