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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
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Write true or false for the statement
Decomposition of leaves is a fast change.
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Classify the following changes as physical or chemical: curdling of milk
Fill in the blank
Revolution of the earth around the sun is a ________ change.
Fill in the blank.
There is no change in the _____________of the substance during a physical 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. |
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
Distinguish physical and chemical changes.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
