Advertisements
Advertisements
प्रश्न
Give a reason why – Rusting of iron is a chemical change but, the magnetization of iron is a physical change.
उत्तर
Rusting of iron is a chemical change as composition changes, the reddish-brown flaky powder is formed with new properties and is irreversible, permanent change but magnetization of iron is temporary and reversible change with no change in composition is a physical change.
APPEARS IN
संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
Changes in which only ______ properties of a substance change are called physical changes.
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
Ripening of fruits is a desirable change.
Write short answer.
Name two reversible changes.
True or false
Change of seasons is a non-periodic change.
A physical change is temporary. Explain.
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Give four difference between physical and chemical changes.
Match the items of Column I with the items of Column II
| Column 1 | 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 |
