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प्रश्न
Give reasons for the following:
A bottle of perfume on opening evolves an odour which can be sensed over a long distance.
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उत्तर
A bottle of perfume on opening evolves an odour because gases diffuse very easily and odour spreads over a large distance.
संबंधित प्रश्न
Give reason:
When an empty gas jar is inverted over a gas jar containing a coloured gas, the gas also spreads into the empty jar.
Write whether the following statement is true or false.
There is no difference between evaporation and boiling.
Name the phenomenon which cause the following change:
Disappearance of camphor.
A solid is a state of matter that has
- no definite shape.
- large intermolecuiar space.
- high intermolecuiar force of attraction.
- no definite volume.
When a stone is dipped in a glass containing some water, the level of water rises but when a spoon of sugar is added to it and stirred, the water level does not rise?
What is volume ?
Give an experiment to explain that there are intermolecular spaces between water molecules.
There are large intermolecular gaps in
What is meant by 'diffusion'? Give one example of diffusion in gases.
Match the following.
| Property | Example |
| Breaks easily (Brittle) | Metal pan |
| Bends readily | Rubber band |
| Can be stretched easily | Cotton wool |
| Gets compressed easily | Mud pot |
| Gets heated readily | Plastic wire |
