An old cycle frame was left in open for a few days. A brown blazer coat slowly deposited on its surface and could not be removed when rubbed with Sandpaper what actually happened?
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Answer: The is made up of iron. Upon exposure to air, iron combined with oxygen and water vapours present as moisture to form a chemical compound with the formula Fe2O3.xH2O(s) . It is known as hydrated ferric oxide and is in the form of a brown mass known as rust; the change was permanent and could not be reversed.
2Fe(s) + 3/2O2(g) -------> Fe2O3.xH2O(s)
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