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प्रश्न
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
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उत्तर
Rust of iron is a chemical change as iron rust [Fe2O3χ H20] is a brown flaky powder having a different composition from original iron metal, which is an irreversible change.
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संबंधित प्रश्न
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Which of the following are physical changes and which are chemical changes ?
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Define a chemical change. Give two examples of the above changes.
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Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
