(i) Reversible
(ii) Reversible
(iii) Reversible
(iv) Irreversible
(v) Reversible
(vi) Irreversible
(vii) Irreversible
Question
Which of the following changes cannot be reversed? (i) Blowing of a balloon. (ii) Folding a paper to make a toy aeroplane. (iii) Rolling a ball of dough to make roti. (iv) Baking cake in an oven. (v) Drying a wet cloth. (vi) Making biogas from cow dung. (vii) Burning of a candle.
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💡 Some Related Questions
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.
Open Answer »Give one example in each case. (i) Change which occurs on heating but can be reversed. (ii) Change which occurs on heating but cannot be reversed. (iii) Change which occurs on cooling but can be reversed. (iv) Change which occurs on mixing two substances, but can be reversed. (v) Change which occurs on mixing two substances, but cannot be reversed.
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