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प्रश्न
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 3. a change that is made by humans | c. physical change |
| 4. a change in which the original substance cannot be obtained | d. periodic change |
| 5. a change where no new substance is formed | e. irreversible change |
| f . slow change |
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उत्तर
| Column A | Column B |
| 1. a change which cannot be easily reversed | e. irreversible change |
| 2 a change that repeats itself at regular intervals | d. periodic change |
| 3. a change that is made by humans | a. man-made change |
| 4. a change in which the original substance cannot be obtained | b. chemical chang |
| 5. a change where no new substance is formed | c. physical change |
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
water cycle in nature —
Write true or false
Rusting of iron is a chemical change.
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Write true or false
A natural change can also be a desirable change.
Which of the following are physical changes ?
- melting of iron metal
- rusting of iron metal
- bending of an iron rod
- drawing a wire of iron metal
Classify the following as a physical or a chemical change.
Drying of wet clothes
Classify the Following as a Physical Or a Chemical Change.
Formation of Clouds
State why addition of sodium chloride to water is considered a physical change, while addition of dilute sulphuric acid to zinc is considered a chemical change.
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible 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. |
