Observe the given Venn
diagram carefully and identify the processes
represented by points 1, 2 and 3.
| 1 | 2 | 3 | |
| A | Burning of fossil fuel | Boiling potatoes | Baking a cake |
| B | Lighting a kerosene stove | Breaking of an egg shell | Photosynthesis |
| C | Burning of paper | Rusting of iron | Spoilage of food |
| D | Burning of LPG gas in kitchen | Crystallisation of copper sulphate | Browning of cut slices of apple |
how can a physican and chemical change occur in one change only ?