Advertisements
Advertisements
प्रश्न
Give a reason why rusting of iron is a chemical change but, the magnetization of iron is a physical change.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
State whether the following is physical or chemical changes.
water cycle in nature —
Which of the following are physical changes and which are chemical changes ?
Glowing of an electric bulb
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
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
Boiling of milk.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
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 |
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
