A remote radio mast can use either a hydrogen fuel cell or a fully charged rechargeable battery as its backup power source. During a test, the air inlet to the fuel cell becomes blocked. Hydrogen is still available and the external circuit for each power source is complete.
Which statement correctly describes what happens to each power source after the air inlet becomes blocked?
The fuel cell stops producing a potential difference, but the battery continues until its reactants can no longer react
Both power sources continue because each external circuit remains complete
The battery stops producing a potential difference, but the fuel cell continues while hydrogen is available
Both power sources stop because neither can operate without a supply of air
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.