Question detail
What is the main product of the overall reaction in a hydrogen fuel cell?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Chemical cells and fuel cells (chemistry only)
Question
- A. Hydrogen gas
- B. Oxygen gas
- C. Water
- D. Carbon dioxide
Answer
Water
Explanation
The overall reaction in a hydrogen fuel cell produces water as the main product when hydrogen is oxidised.
Common mistake
Misunderstanding fuel supply in fuel cells
Students often think a fuel cell needs a continuous external supply of oxygen and water, just like a battery needs a continuous supply of reactants
Explain that a fuel cell requires only the fuel (e.g. hydrogen) and an oxidiser (usually oxygen from air); water is a product, not a required input, and the cell can operate as long as fuel and oxygen are available
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