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Question
What are fuel cells?
Solution
The galvanic cell in which two energy of combustion of fuels is directly connected into electrical energy Called fuel cell.
Reaction of cell :
Oxidation at anode :
At anode hydrogen gas is oxidized to H2O.
\[\ce{2H2(g) + 4OH-(aq) -> 4H2O(l) + 4e-}\]
Reduction at cathode (+)
The electrons released at anode travel to cathode through the external circuit.
Here O2(g) is reduced to `"OH"-`
\[\ce{O2(g) + 2H2O(l) + 4e- -> 4OH- }\]
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RELATED QUESTIONS
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| Column I | Column II |
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| (ii) Mercury cell | (b) prevented by galvanisation |
| (iii) Fuel cell | (c) gives steady potential |
| (iv) Rusting | (d) Pb is anode, PbO2 is cathode |
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