A student sets up an experiment to investigate the corrosion of iron. They place an iron nail into a test tube containing tap water and leave it exposed to the air. After several days, an orange-brown layer of rust forms on the nail.
Which gas from the air has reacted with the iron nail to cause this rusting?
Carbon dioxide
Nitrogen
Oxygen
Argon
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.
