Fuel Cell
Easychemistry
In a hydrogen-oxygen fuel cell, the overall reaction is:
Select the correct option:
Solution
Incorrect! Answer:
2H₂ + O₂ → 2H₂O
A Fuel Cell converts the chemical energy of a fuel (like hydrogen) directly into electrical energy.
- In the H2−O2 fuel cell (used in the Apollo space program):
- Anode: 2H2+4OH−→4H2O+4e−
- Cathode: O2+2H2O+4e−→4OH−
- Overall Reaction: 2H2(g)+O2(g)→2H2O(l)
- Advantages: It is highly efficient and produces only water as a byproduct, making it pollution-free.
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About This Question
- Subject
- chemistry
- Chapter
- redox reactions and electrochemistry
- Topic
- fuel cell
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
2H₂ + O₂ → 2H₂O
A Fuel Cell converts the chemical energy of a fuel (like hydrogen) directly into electrical energy.
- In the H2−O2 fuel cell (used in the Apollo space program):
- Anode: 2H2+4OH−→4H2O+4e−
- Cathode: O2+2H2O+4e−→4OH−
- Overall Reaction: 2H2(g)+O2(g)→2H2O(l)
- Advantages: It is highly efficient and produces only water as a byproduct, making it pollution-free.
This easy difficulty chemistry question is from the chapter redox reactions and electrochemistry, covering the topic of fuel cell. It appeared in the 2025 exam.
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