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 changes involved in the following process as physical or chemical changes:
Photosynthesis
Choose the most appropriate answer.
Rising and setting of the sun at a given place is a
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
What are man-made changes ?
Solve this crossword by using the clues that follow-
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
Classify the following as physical or chemical change :
Formation of curd from milk
Which of the following are physical changes and which are chemical changes ?
Freezing of water
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
