An iron fence post is coated in a layer of zinc. Over time, the fence post becomes deeply scratched, exposing the underlying iron to rainwater and oxygen. Even though the iron is exposed, it does not rust.
Explain why the iron has not rusted.
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.
