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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
Fill in the blank.
When a candle burns, wax melts. Melting of wax is a ________ change.
Write true or false
Cutting of paper into pieces is a chemical change.
Write true or false
Melting of ice is a physical change.
Write true or false
Burning of sugar is a temporary change.
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
Fill in the blank
Heat is ________ by a gas during the process of condensation.
Write true or false
A natural change can also be a desirable change.
What are man-made changes ?
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
