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Question
Which of the following changes cannot be reversed?
- Blowing of a balloon
- Folding paper to make a toy aeroplane
- Rolling a ball of dough to make roti
- Baking cake in an oven
- Drying a wet cloth
- Making biogas from cow dung
- Burning of a candle
Solution
The following changes are irreversible-
(d) Baking cake in an oven,
(f) Making biogas from cow dung.
(g) Burning of a candle.
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