Choose the correct answer for the following assertion and reason questions:
1.
| Assertion (A): | The explosion of fire cracker is a irreversible change. |
| Reason (R): | The firecracker undergoes a chemical reaction forming a new substance. |
2.
| Assertion (A): | The burning of a candle shows that physical and chemical changes can occur together. |
| Reason (R): |
Melting of wax is a chemical process, whereas burning of wax vapour is a physical process.
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