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Question


Which of the following changes are Reversible and Irreversible?

(a) Blowing of a balloon

(b) Folding a paper to make a toy aeroplane

(c) Rolling a ball of dough to make roti

(d) Baking cake in an oven

(e) Drying a wet cloth

(f) Making biogas from cow dung

(g) Burning of a candle


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Solution

Reversible changes :

(a) Blowing of a balloon,
(b) Folding paper to make a toy aeroplane
(c) Rolling a ball of dough to make roti,
(e) Drying a wet cloth.

Irreversible changes :
(d) Baking of a cake,
(f) Making biogas from cow dung,
(g) Burning of a candle.


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