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प्रश्न
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
विकल्प
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.
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उत्तर
Both A and R are true but R is not the correct explanation of A.
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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.
Explain the following giving an example.
Pure substance
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Write short answer.
Sublimation is classified as a physical change. Why ?
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 |
Make a list of different types of changes with example.
Classify the following as a physical or a chemical change.
Boiling of water
Differentiate between a physical change and a chemical change with reference to – Formation of products.
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
The change of state of a substance from solid to liquid and liquid to gas is ______.
