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Reaction of Metals with Oxygen

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Question

When substances made of iron are exposed to oxygen and moisture over a period of time, ___ takes place.

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Solution

When iron is exposed to water or air over a period of time, the iron reacts with oxygen in the presence of moisture to form a reddish-brown chemical compound, iron oxide. This is referred to as rust. So chemically, rust is hydrated iron(III) oxide or Fe₂O₃.nH₂O

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