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प्रश्न
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
विकल्प
True
False
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उत्तर
False.
Dissolving of solute in a solvent is a physical change and rusting of iron is a chemical change.
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संबंधित प्रश्न
Fill in the blank.
A new substance is formed in a ............... change.
Dissolving salt in water is a reversible change.
Classify the following changes as physical or chemical.
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Give four difference between physical and chemical changes.
Compare the energy changes involved during a physical and a chemical change.
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 |
Classify the following as physical or chemical properties
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
Keeping a stone in sunlight for few hours is ______.
