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प्रश्न
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
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उत्तर
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | B: Chemical change |
| 4. Tarnishing of copper | B: Chemical change |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. | A: Physical change |
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संबंधित प्रश्न
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Write true or false for the statement
Decomposition of leaves is a fast change.
Classify the following changes as physical or chemical:- melting of a solid (wax)
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
Name the following.
A form of energy required for a chemical change.
Name the following.
The gaseous product of the chemical change which takes place during respiration in living organisms.
Give an example of a physical change in which the color of the substance changes.
Explain the characteristics of physical change with examples.
