A coastal lighthouse is comparing a hydrogen fuel-cell system with a rechargeable battery for its electrical supply. Hydrogen would be stored at the lighthouse before it was fed into the fuel cell.
Which statement gives a correct comparison of the storage safety of the two systems?
The battery has the greater storage risk, because it must be kept under high pressure.
The fuel-cell system has the smaller storage risk, because water is its only product.
The fuel-cell system has the greater storage risk, because hydrogen is highly flammable.
The two systems have the same storage risk, because both change chemical energy into electrical energy.
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.