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प्रश्न
What are fuel cells?
उत्तर
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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संबंधित प्रश्न
Suggest two materials other than hydrogen that can be used as fuels in fuel cells.
Write two advantages of fuel cell
Which of the following acts as oxidising agent in a hydrogen-oxygen fuel cell?
In H2–O2 fuel cell, the reaction taking place at negative electrode is:
What advantage do the fuel cells have over primary and secondary batteries?
Match the items of Column I and Column II.
| Column I | Column II |
| (i) Lead storage battery | (a) maximum efficiency |
| (ii) Mercury cell | (b) prevented by galvanisation |
| (iii) Fuel cell | (c) gives steady potential |
| (iv) Rusting | (d) Pb is anode, PbO2 is cathode |
Which of the following statements regarding fuel cell is incorrect?
Draw labelled diagram of H2 – O2 fuel cell.
Write two applications of fuel cells.
Which of the following cell was used in the Apollo space programme?
