Paheli mixed flour and water and (i) made a dough, (ii) rolled the dough to make a chapatti, (iii) baked the chapatti on a pan, (iv) dried the chapatti 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.

Question

Philoid · Accepted Answer

The changes that can be reversed are

(I) Making a dough

(II) Rolling the dough to make a chapatti

In both these steps, there is change only in the physical state or form of the dough, which can be reversed.

The changes that cannot be reversed are:

(iii) baking the chapatti

(iv) drying and grinding the chapatti to make powder

As these steps involve a change in the chemical properties of dough, they cannot be reversed.