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| 1. |
Which of the following changes cannot be reversed?(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 |
| Answer» (d), (f) and (g) | |