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5.2 Chemical cells and fuel cells

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Question 5

A hydrogen fuel cell supplies electricity to a remote air-quality monitoring station. The cell contains an acidic electrolyte. Oxygen from the air reacts at one of the electrodes.

Which of the following is the balanced half equation for the reaction at this electrode?

[1]
A

O2+4H+→2H2O+4e−\text{O}_2 + 4\text{H}^+ \rightarrow 2\text{H}_2\text{O} + 4\text{e}^-O2​+4H+→2H2​O+4e−

B

2O2+4H++4e−→2H2O2\text{O}_2 + 4\text{H}^+ + 4\text{e}^- \rightarrow 2\text{H}_2\text{O}2O2​+4H++4e−→2H2​O

C

O2+2H++2e−→2H2O\text{O}_2 + 2\text{H}^+ + 2\text{e}^- \rightarrow 2\text{H}_2\text{O}O2​+2H++2e−→2H2​O

D

O2+4H++4e−→2H2O\text{O}_2 + 4\text{H}^+ + 4\text{e}^- \rightarrow 2\text{H}_2\text{O}O2​+4H++4e−→2H2​O

Markscheme

5.2 Chemical cells and fuel cells Questions

  1. GCSE
  2. /Chemistry
  3. /5.2 Chemical cells and fuel cells

90 exam-style questions on AQA GCSE Chemistry 5.2 Chemical cells and fuel cells, covering 5.2.1 Cells and batteries, 5.2.2a Fuel cells, and 5.2.2b Half equations for hydrogen fuel cells. Each one has a worked solution and a mark scheme showing where the marks go.

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