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प्रश्न
State three characteristics of molecules of matter.
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उत्तर
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Molecules are very small:
- Molecules are tiny particles that cannot be seen with the naked eye. They make up all matter, such as solids, liquids, and gases.
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Molecules are always moving:
- In solids, molecules vibrate in fixed positions.
- In liquids, they move more freely.
- In gases, they move very fast and spread in all directions.
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Molecules are held together by forces:
- Molecules are held together by attractive forces called intermolecular forces. These forces are strongest in solids, weaker in liquids, and weakest in gases.
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संबंधित प्रश्न
Water at 100°C has more heat than the steam at 100°C.
Write true or false for the following statement
In a gas, the molecules can move anywhere in space.
Distinguish between solids, liquids, and gases on the basis of their following properties :
(a) compressibility
(b) fluidity
(c) rigidity
(d) expansion on heating
Fill in the blank
......... can flow.
Fill in the blank
Water boils at .............
Write true or false for the statement. Rewrite the false statement correctly.
Solids can be compressed easily.
Multiple choice question.
The process by which a solid changes into a liquid is called
Give two examples for each type of matter
State the correct term from A, B, C, D, E, or F in List II which represents the change of state of matter or its relevant property from List I.
| List I | List II |
| 1. Solid 'X' to a Liquid 'X' | A: Condensation |
| 2. Liquid 'Y' to its vapour 'Z' | B: Vaporization |
| 3. 'Z' to 'Y' | C: Melting |
| 4. 'Y' to 'X' | D: Freezing |
| 5. The temperature at which 'Y' changes to 'Z' | E: Melting point |
| F: Boiling point |
Define the term ‘Liquefaction of gases’.
