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प्रश्न
Write true or false
Rusting of iron is a chemical change.
पर्याय
True
False
उत्तर
True
APPEARS IN
संबंधित प्रश्न
Classify the following as chemical or physical change:
Boiling of water to form steam.
Write short answer.
Give an example of desirable change which can also be undesirable
State whether the following is physical or chemical changes.
Slaking of lime —
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Which of the following are physical changes and which are chemical changes ?
Glowing of an electric bulb
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Fill in the blank with the correct word of the statement given below:
Sublimation of iodine is an example of _________ change.
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
Tearing of sheet of paper into pieces is ______ By the process of Heating of water, change.
