rusting of iron is a irreversible change. but can't we get the iron back by electroplating
You people are correct. We cannot get iron back from rusted iron by electroplating.
Rusting of Iron is a chemical change. It reacts with moist air to form a new compound called rust with molecular formula Fe2O3.nH2O. This oxide layer, rust is not stable and falls off after certain time. Thus rusting of iron is irreversible change i.e. Rust once formed can not be converted back into iron.