why rusting of iron cannot be called a periodic change ?
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The formation of rust is completely a new substance due to the reaction of oxygen with the iron, which is termed to be a chemical change. So , it not possible to avoid the rust formation and the change is irreversible.
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Explanation:Formation of rust is a new substance formed by the reaction of oxygen with iron which is termed as chemical change and it can not be reversed or repeated,Hence rusting of iron is not a periodic change.
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