Question

rusting of iron is an irreversible change?
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Answer 1

Answer:

True, iron once rusted, cannot be brought back to it's original form because an oxide layer is formed on it which slowly eats the metal away due to corrosion.

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Answer 2

yes it is an irreversible change as rusting of iron makes ferrous oxide

we can only obtain it by laboratory process which removes the oxygen by electro-chemical ways