Advertisements
Advertisements
Question
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.
Options
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.
Advertisements
Solution
Both A and R are true but R is not the correct explanation of A.
APPEARS IN
RELATED QUESTIONS
Classify the following changes as physical or chemical:- melting of a solid (wax)
State whether the following is physical or chemical changes.
Slaking of lime —
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 |
The rusting of an iron object is called :
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. |
Give a reason why rusting of iron is a chemical change but, the magnetization of iron is a physical change.
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
Name the following.
A form of energy required for a chemical change.
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
Cutting a log of wood into pieces is a chemical change.
