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प्रश्न
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
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उत्तर
Iron III oxide [Fe2O3x H20]
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
shaping a piece of glass —
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
True or false
Is the process of digestion a physical change?
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Differentiate between a physical change and a chemical change with reference to – Formation of products.
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. |
Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
What kind of change is shown by tearing of paper?
Give two examples for the following case:
Physical changes which are not reversible
Explain the characteristics of physical change with examples.
