An engineer is choosing two metals to use as the electrodes of a simple cell for an emergency location beacon.
The available metals are listed in order of decreasing reactivity:
magnesium, zinc, iron, copper
Each possible cell would use the same electrolyte under the same conditions.
Which pair of metals would be expected to give the greatest voltage?
Magnesium and copper
Magnesium and zinc
Zinc and copper
Iron and copper
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.