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प्रश्न
The rusting of an iron object is called :
पर्याय
corrosion and it is a physical as well as a chemical change
dissolution and it is a physical change
corrosion and it is a chemical change
dissolution and it is a chemical change
उत्तर
corrosion and it is a chemical change
Rusting of iron takes place in the presence of air (O2) and water vapour. Action of air and moisture on iron converts it to its oxide. This process is called corrosion and it leads to the formation of a new compound. Therefore, it is a chemical change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
Try segregating the things around you as pure substances or mixtures.
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Classify the following changes as physical or chemical:- photosynthesis in plants
True or false
In a physical change no net energy change is involved.
Distinguish between the following.
Physical change and chemical change
Fill in the blank with the correct word of the statement given below:
Sublimation of iodine is an example of _________ change.
State which of the following 1 to 5 pertain to – A: Physical Change B: Chemical change :
- Sublimation.
- Fermentation.
- Liquefaction or condensation.
- Magnetization.
- Respiration.
Give the reason why the following is considered as chemical changes.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
Give an example of a physical change in which the color of the substance changes.
