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प्रश्न
The rusting of an iron object is called :
विकल्प
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
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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:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Write true or false
Cutting of paper into pieces is a chemical change.
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
Classify the following as a physical or a chemical change.
Burning of coal
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
What type of energy changes is associated when ice melts?
Sublimation of Iodine is a ______.
