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प्रश्न
Give a reason for the Pure substances have fixed melting or boiling points.
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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
The temperature of a substance remains unaffected during its change of state.
Boiling takes place at all temperatures.
How do the solids, liquids, and gases differ in their following properties.
(a) Size
(b) Shape
(c) Density
Give reason :
Why do liquids and gases flow but solids do not?
Fill in the blank
Any matter which has a definite ................. but no definite shape is called a ...............
Write true or false for the statement. Rewrite the false statement correctly.
Solids can be compressed easily.
Fill in the blank with the correct word Given below.
Brownian movement is maximum in ____.
State the correct term from A, B, C, D, E, or F in List II which represents the change of state of matter or its relevant property from List I.
| List I | List II |
| 1. Solid 'X' to a Liquid 'X' | A: Condensation |
| 2. Liquid 'Y' to its vapour 'Z' | B: Vaporization |
| 3. 'Z' to 'Y' | C: Melting |
| 4. 'Y' to 'X' | D: Freezing |
| 5. The temperature at which 'Y' changes to 'Z' | E: Melting point |
| F: Boiling point |
For removing grains from stalks, the ______ method is used.
Gas like the state of Matter that exists at extremely cold temperatures used in the field of cryogenics.
