Home / iGCSE Chemistry 0620 Extended – 4.2 Hydrogen–oxygen fuel cells- Exam Style Questions Paper 2

iGCSE Chemistry 0620 Extended - 4.2 Hydrogen–oxygen fuel cells- Exam Style Questions Paper 2- New Syllabus

iGCSE Chemistry MCQ (Extended) Paper 2 - All Chapters

Question

Hydrogen-oxygen fuel cells are used in electric cars.

Three statements about these fuel cells are listed.

  1. The process in the cell is called electrolysis.
  2. Water is broken down in the cell to produce hydrogen, oxygen and electricity.
  3. Water is the only chemical product formed in the reaction.

Which statements are correct?

A. 1 and 2
B. 1 and 3
C. 2 only
D. 3 only

▶️ Answer/Explanation
Fuel cells combine hydrogen and oxygen to produce electricity, with water as the only chemical byproduct. This is the reverse of electrolysis. Electrolysis uses electricity to split water. Statement 3 is correct.
✅ Answer: (D)

Question

In a fuel cell, a fuel is oxidised to produce electricity. Which row describes the fuel and the oxidising agent used?

▶️ Answer/Explanation
A hydrogen-oxygen fuel cell uses hydrogen (\(\mathrm{H_2}\)) as the fuel, which is oxidised, and oxygen (\(\mathrm{O_2}\)) as the oxidising agent, which is reduced. The overall reaction is: \(2\mathrm{H_2 + O_2 \rightarrow 2H_2O}\), producing water as the only chemical product.
✅ Answer: (B)

Question

Which equation represents the overall reaction in a hydrogen-oxygen fuel cell?

A. 2H₂ + O₂ → 2H₂O
B. 2H₂O → 2H₂ + O₂
C. H₂ + O₂ → H₂O₂
D. H₂O₂ → H₂ + O₂

▶️ Answer/Explanation
A hydrogen-oxygen fuel cell combines hydrogen and oxygen gas to produce electrical energy, with the only chemical product being water. The balanced equation for this overall reaction is 2H₂ + O₂ → 2H₂O. The reverse reaction (B) represents the electrolysis of water, while options C and D involve hydrogen peroxide, which is not the product in a typical fuel cell.
✅ Answer: (A)
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