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5.2 Chemical cells and fuel cells

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Question 29
H

A hydrogen fuel cell has an alkaline electrolyte that contains hydroxide ions. Which half equation represents the reaction at the positive electrode of this fuel cell?

[1]
A

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

B

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

C

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

D

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

Markscheme

5.2 Chemical cells and fuel cells Questions

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

40 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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