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प्रश्न
Give a reason why rusting of iron is a chemical change but, the magnetization of iron is a physical change.
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उत्तर
Rusting of iron is a chemical change, as composition changes, the reddish-brown flaky powder is formed with new properties and is an irreversible, permanent change, but magnetization of iron is a temporary and reversible change with no change in composition and is a physical change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Write true or false for the statement
A natural change can also be a desirable change
Classify the Following as a Physical Or a Chemical change.
Glowing of an Electric Bulb
Given reason:
Burning of paper is a chemical change.
Change is the law of nature which occurs in everyday life.
State when a substance [i.e. matter] undergoes a kind of change.
Select the chemical changes from the following list of changes
The occurrence of lightning.
What type of change is colouring of a paper?
What kind of change is shown by tearing of paper?
