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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_2O to 2Fe_2O_3, xH_2O "(rust)"`
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