If rusting of iron is a chemical change than how it converts back to its original form (iron). As I have seen that if we pore cold drinks on rusting iron and keep it for sometimes. And then if we wash the iron with water than it will convert back to its original form. I have seen with my own eyes......

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Solution

The rusting of ion is a chemical change because the iron atoms form chemicalbonds with the oxygen atoms to form iron oxide molecules. But the rusting only form on outer surface only and rest iron of inner layers is in original form.
When we pore cold drinks on rusting iron and keep it for sometime, it wipe out the outer layer and rusting get removed.

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Q. Statement I: If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

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