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प्रश्न
When sodium chloride is added to a definite volume of water and stirred well, a solution is formed, but there is no increase in the level of water. Why?
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उत्तर
This is because there is some space between the particles of water in which the salt particles get accomodated when dissolved.
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संबंधित प्रश्न
Fill in the blank:
The temperature at which a liquid starts changing into its vapour state is ______.
Define the following term.
Element
Give reason:
A red ink drop added to small amount of water in a glass turns water red in some time.
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. |
The process by which a solid changes into a liquid is called
- freezing
- melting
- condensation
- evaporation
Fill in the blank
The molecules are at a greater distance in ______ compared to liquids.
In which of the following conditions, the distance between the molecules of hydrogen gas would increase?
- increasing pressure on hydrogen contained in a closed container
- some hydrogen gas leaking out of the container
- increasing the volume of the container of hydrogen gas
- adding more hydrogen gas to the container without increasing the volume of the container
Define: interconversion of states of matter.
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.
The Cow and Birds are nonliving things.
