Advertisements
Advertisements
प्रश्न
Classify the following as chemical or physical change:
Rusting of almirah
विकल्प
Chemical change
Physical change
Advertisements
उत्तर
Chemical change
Explanation:
Rusting of an almirah is a chemical alteration because it produces a new chemical molecule known as hydrated iron oxide (rust).
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
True or false
Change of seasons is a non-periodic change.
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 3. a change that is made by humans | c. physical change |
| 4. a change in which the original substance cannot be obtained | d. periodic change |
| 5. a change where no new substance is formed | e. irreversible change |
| f . slow change |
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Change is the law of nature and occurs in our everyday life, at all times and in all places. Differentiate between the following change with a suitable example.
Desirable and undesirable change.
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
Select the chemical changes from the following list of changes
Butter turning rancid
What type of energy changes is associated when ice melts?
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 |
The change of state of a substance from solid to liquid and liquid to gas is ______.
