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What is rust ? Give the equation for for...

What is rust ? Give the equation for formation of rust .

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When iron is exposed to moist air, it forms a layer of brown hydrated ferric oxide on its surface. This compound is known as rust and the phenomenon of formation of rust is known as rusting.
`4Fe+3O_(2)+xH_(2)Otounderset((Rust))(2Fe_(2)O_(3)).xH_(2)O`
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