Iron objects, such as nails, rust when they are exposed to water and a specific gas in the atmosphere.
Which gas in the air is essential for this corrosion process to occur?
nitrogen
oxygen
helium
carbon dioxide
97 exam-style questions on Edexcel GCSE Chemistry 6.1 Transition metals, alloys and corrosion, covering 6.1.1 Properties of transition metals, 6.1.2 Corrosion and its prevention, and 6.1.3 Alloys and the uses of metals. Each one has a worked solution and a mark scheme showing where the marks go.