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प्रश्न
Sublimation is classified as a physical change. Why ?
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उत्तर
Physical changes are those in which no new substance is formed. In sublimation there is direct conversion of solid into gas and vice versa. Thus the substance remains the same.
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संबंधित प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
Write true or false
Deforestation is a man-made change.
Give two examples of periodic changes.
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Given reason:
Burning of paper is a chemical change.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Select the chemical changes from the following list of changes
Butter turning rancid
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
