Question

Paheli mixed flour and water and
(i) made a dough,
(ii) rolled the dough to make 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.

Answer 1

A reversible change is a change which can be reversed back to the original state of the substance.

An irreversible change is a change which cannot be reversed back to the original state of the substance.

Reversible changes:
(ii) Rolling of dough.

Irreversible changes:
(i) Making of dough.
(iii) Baking of rolled chapati.
(iv) Grinding of dried chapati.