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प्रश्न
Write true or false
Burning of paper and formation of curd are reversible changes.
विकल्प
True
False
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उत्तर
False.
Burning of paper and formation of curd are irreversible changes.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Cutting of trees
State the differences between a physical change and a chemical change.
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Write true or false
Earthquake is a desirable change.
State the various conditions that favour the process of evaporation.
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. |
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Select the correct answer from the choice given below to complete the sentence
The matter is added or removed during a ____________ change.
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
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.
