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प्रश्न
Give a reason why –
Solids have a definite volume & a definite shape.
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उत्तर
Any matter that is solid has a definite shape and a definite volume. The molecules in a solid are in fixed positions and are dose together. Although the molecules can still vibrate, they cannot move from one part of the solid to another part. As a result, a solid does not easily change its shape or its volume.
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संबंधित प्रश्न
Define interconversion of states of matter.
How will you prove by an experiment that solids occupy space ?
For the following statement, say whether it describes a solid, a liquid or a gas.
Particles move about very quickly.
Match the following
| Column A | Column B |
| (a) Solids | (1) Can flow in all directions. |
| (b) Sublimation | (2) The temperature at which a liquid changes into its gaseous state. |
| (c) Boiling point | (3) Any number of free surfaces. |
| (d) Gases | (4) Gaps between particles. |
| (e) Intermolecular space | ro(5) Change of state fm solid to gas. |
Match the columns.
| (1) iron and gold | (a) molecules are very far apart |
| (2) melting | (b) pure substance |
| (3) intermolecular space | (c) non - metals |
| (4) compound | (d) the space between the molecules |
| (5) gases | (e) change from solid to liquid |
| (f) metals |
There are large intermolecular gaps in
- water
- iron ball
- common salt
- air
When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?
What is meant by 'diffusion'? Give one example of diffusion in gases.
Give a reason for the following:
Liquids have one free upper surface only.
With reference to the liquid state of matter – answer the following
State why the inter-particles attraction decreases to negligible.
