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प्रश्न
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
अति संक्षिप्त उत्तर
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उत्तर
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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