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
Practise Edexcel GCSE Chemistry Transition metals, alloys and corrosion with exam-style questions for Foundation and Higher tier. 97 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
