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
Classify the following as chemical or physical change:
Melting of butter in a pan
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 following as chemical or physical change:
Dissolving common salt in water.
Ripening of fruits is a desirable change.
True or false
Is melting of ice a reversible change?
Classify the following as a physical or a chemical change.
Burning of coal
Select the chemical changes from the following list of changes
Drying of a fruit
Select the chemical changes from the following list of changes
The occurrence of lightning.
State which of the following 1 to 5 pertain to – A: Physical Change B: Chemical change :
- Sublimation.
- Fermentation.
- Liquefaction or condensation.
- Magnetization.
- Respiration.
Match the items of Column I with the items of Column II.
| Column I | Column II | ||
| (a) | Large crystals | (i) | Turns lime water into milky |
| (b) | Depositing a layer of zinc on iron | (ii) | Physical change |
| (c) | Souring of milk | (iii) | Rust |
| (d) | Carbon dioxide | (iv) | Sugar candy (Mishri) |
| (e) | Iron oxide | (v) | Chemical change |
| (f) | Dissolving common salt in water | (vi) | Galvanisation |
