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Iron is oxidised when it turns to rust. The iron atoms lose electrons forming Iron(III) ions, which form a non-stoichiometric compound with oxygen and hydroxide ions and water. Rust is a much weaker substance than iron, and very crumbly, so iron loses its strength and may crumble away.
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Related questions
What transition metal rusts when exposed to oxygen?
Iron rusts in the presence of Oxygen.
Which metal rusts first copper or iron?
Neither. Only iron rusts. Other metals oxidize.
What if oxygen is removed from a sample of air as iron rusts what happen to the partial pressure of oxygen in the air?
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What rusts faster?
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Why does the iron rusts when magnesium is put in the water with the iron?
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Iron rusts.
Why do old railway tracks rust?
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When iron rusts iron atoms are destroyed true or false?
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