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प्रश्न
Give a reason for the Pure substances have fixed melting or boiling points.
उत्तर
Pure substances consist of only one kind of matter. All the particles of a pure substance are alike. It has a definite composition and similar properties. This is the reason that pure substances have fixed melting or boiling points.
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संबंधित प्रश्न
Ice melts at 100°C.
The process of a gas converting directly into solid is called vaporization.
Name the three states of matter.
State the general properties of a solid.
Why liquids do not have definite shape?
Give reason :
Liquids have a definite volume but no definite shape.
Fill in the blank
The physical state of a substance, which has a fixed volume but no fixed shape is ...............
All kinds of matter
Fill in the blank with the correct word Given below.
Brownian movement is maximum in ____.
Match the arrangement of atoms in the three states of matter in List I with the correct state in List II.
| List I | List II |
| 1. Arrangement of atoms is far apart | A: Solids |
| 2. Force of attraction between atoms is very strong | B: Liquids |
| 3. Movement of atoms is in any random direction | C: Gases |
| 4. Particles diffuse very easily | |
| 5. Particles show movement about their own position |
