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प्रश्न
Name the phenomenon which cause the following change.
Disappearance of camphor.
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उत्तर
Disappearance of camphor is sublimation.
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संबंधित प्रश्न
Write true or false for the following statement
In a gas, the molecules can move anywhere in space.
Fill in the blank
In a solid, the molecules ............................................ but they remain at their fixed positions.
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
When a gas is cooled, its molecules .............. energy.
For the following statement, say whether it describes a solid, a liquid, or a gas.
Particles move about very quickly.
Give two examples for of the following
Substances which do not change their states.
Match the following
| Column A | Column B | ||
| a | Solids | 1 | Can flow in all directions |
| b | Sublimination | 2 | The temperature at which a liquid changes into its gaseous state |
| c | Boiling Point | 3 | Can have any number of free surfaces |
| d | Gases | 4 | Gaps between particles |
| e | Intermolecular space | 5 | Change of state from solid to gas |
State the property of the following substance.
Sulphur is a yellow amorphous powder insoluble in water.
Match the characteristics of the three states of matter in List I with their correct answer from List II.
| List I | List II |
| 1. Are highly rigid and have a definite shape | A: Solids and gases only |
| 2. Have no definite shape | B: Solids only |
| 3. Have definite volume but no definite shape | C: Liquids and gases only |
| 4. Are highly compressible and least rigid | D: Gases only |
| 5. Have no definite volume | E: Solid, liquids and gases |
| 6. Have no definite shape and volume |
F: liquids only |
| 7. Occupy space | G: Solids and liquids only |
| 8. Are not compressible | |
| 9. Are slightly compressible | |
| 10. Have mass |
Define the term ‘Liquefaction of gases’.
