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Paheli mixed flour and water and (i) made a dough, (ii) rolled the dough to make a chapati, (iii) baked the chapati on a pan, (iv) dried the chapati and ground it in a grinder to make powder. Identify the changes (i) to (iv) as the changes that can be reversed or that cannot be reversed.
 
(i)Made a dough -
 
(ii)Rolled the dough to make a chapati -
 
(iii)Baked the chapati on a pan -
 
(iv)Dried the chapati and ground it in a grinder to make powder -