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प्रश्न
A piece of chalk can be broken into small particles by hammering but a piece of iron cannot be taken into small particles by hammering. Which characteristic of the particles of matter is illustrated by these observations?
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उत्तर
Matter is made up of small particles which attract each other. This force of attraction differs from substance to substance. Chalk breaks easily on hammering while iron does not. This shows that particles of iron attract each other with a greater force than the particles of chalk.
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संबंधित प्रश्न
Fill in the blank:
The process in which a solid directly changes into a gas is called ....................
What are the two conditions for the interconversion of states of matter ?
Fill in the blank:
All matter is made up of tiny particles called..................
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. |
Give two examples of the following:
Substances which do not change their states.
There are large intermolecular gaps in
- water
- iron ball
- common salt
- air
What is meant by 'diffusion'? Give one example of diffusion in gases.
Give a reason why –
Solids have a definite volume & a definite shape.
State the term which refers to the conversion of a substance on heating from.
- solid-state to liquid state
- liquid state to vapour state
- vapour state to liquid state
- liquid state to solid-state.
Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in the following case.
During soldification, the inter-particle space __________ gently.
