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प्रश्न
Give a reason why:
Gases have no definite volume and no definite shape.
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उत्तर
Any matter that is a gas has no definite volume and no definite shape. The molecules in a gas are least closely packed and intermolecular space between them is very large when compared to solids and liquids. The intermolecular force of attraction between the particles are negligible. As a result, a liquid does not easily change its shape nor they have fixed volume.
संबंधित प्रश्न
Give two example of the following:
The substances which do not change their state on heating.
Fill in the blank:
Water is a matter because it has mas and occupies....................
Give two examples of the following:
Substances which do not change their states.
A substance which can change its state
- wood
- oxygen
- paper
- cloth
The process by which a solid changes into a liquid is called
- freezing
- melting
- condensation
- evaporation
Give reason of When a teaspoon of sugar is added to half a glass of water and stirred, the water level in the glass does not rise.
Which one of the following statements is not true?
- the molecules in a solid vibrate about a fixed position
- the molecules in a liquid are arranged in a regular pattern
- the molecules in a gas exert negligibly small forces on each other, except during collisions
- the molecules of a gas occupy all the space available
Give reasons for the following:
Solids have a definite shape and are highly rigid while gases have to definite shape and are least rigid.
Fill in the blank with the correct word Given below.
The space between atoms’ [molecules] of solids is ____
You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well labelled diagram.
