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प्रश्न
True or false
Change of seasons is a non-periodic change.
पर्याय
True
False
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उत्तर
False.
Change of seasons is a periodic change.
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संबंधित प्रश्न
Try segregating the things around you as pure substances or mixtures.
State whether the following is physical or chemical change.
Digestion of food —
True or false
Is the process of digestion a physical change?
Given reason:
Burning of paper is a chemical change.
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
Ammonium chloride is also a sublimable solid. Give a reason why the sublimation of ammonium chloride involves a physical and a chemical change.
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. |
Distinguish physical and chemical changes.
When solute is dissolved in a solvent it forms a solution.
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
