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प्रश्न
Why do gases have neither a fixed shape nor a fixed volume?
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उत्तर
Gases do not have fixed shape and volume because they have very small inter-molecular force of attraction and large inter-molecular space. Since, the particles of a gas are free to move anywhere, it takes the shape and volume of the container.
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संबंधित प्रश्न
Give reasons:
A gas fills completely the vessel in which it is kept.
State whether the following statement is true or false :
Red-brown bromine vapour diffuse into air in a gas jar but the colourless air molecules do not diffuse into bromine vapour.
When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance quickly spreads in the entire room. Name the process involved in this.
A girl is cooking some food in the kitchen. The smell of food being cooked soon reaches her brother's room. Explain how the smell could have reached her brother's room.
What does the diffusion of gases tell us about their particles?
When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment :
Look at the diagram on the right side. Jar A contains a red-brown gas whereas jar B contains a colourless gas. The two gas jars are separated by a galas plate placed between them
- What will happen when the glass plate between the two jars is pulled away?
- What name is given to the phenomenon which takes place?
- Name the brown gas which could be in jar A.
- Which is the colourless gas most likely to be present in jar B?
- Name one coloured solid and one colourless liquid which can show the same phenomenon.
______ is not affected by gravity.
Comment upon the following:-
rigidity
Explain why?
- A gas fills a vessel completely?
- Camphor disappears without leaving any residue.
