An agricultural sensor can be powered by a rechargeable battery or a hydrogen fuel cell. A technician compares what happens inside the battery during charging with what happens inside the fuel cell while it is operating.
Which account is correct?
The external current makes the battery's reaction continue in the same direction, while the fuel cell makes oxygen inside the cell
The external current restores the battery's reactants without reversing its reaction, while the fuel cell uses electricity to make its fuel
The external current supplies fuel to the battery, while the fuel cell stores fuel and oxygen inside it before use
The external current drives the battery's reaction in the opposite direction, while the fuel cell uses fuel and oxygen supplied from outside the cell
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.