Essential Chemistry for IGCSE - Metals And Reactivity (Section 3 - No. 10)
Which of the following correctly describes the formation of rust?
Iron reacts with oxygen.
Water must be present.
It's a reduction reaction.
A coating of rust on the surface protects the underlying metal.
Explanation
Iron reacts with oxygen in the presence of water (oxidation). The rust does not protect the metal.
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