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प्रश्न
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
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उत्तर
FeSO4 (Iron Sulphate)
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संबंधित प्रश्न
Write short answer.
What are man-made changes ?
State the differences between a physical change and a chemical change.
Classify the following changes as physical or chemical:- melting of a solid (wax)
Classify the following changes as physical or chemical:-boiling
State whether the following is physical or chemical changes.
photosynthesis —
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 |
Change is the law of nature and occurs in our everyday life, at all times and in all places. Differentiate between the following change with a suitable example.
Desirable and undesirable change.
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective 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.
