Advertisements
Advertisements
प्रश्न
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
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
Advertisements
उत्तर
A is false but R is true
APPEARS IN
संबंधित प्रश्न
Explain the following giving an example.
Pure substance
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Classify the following changes as physical or chemical:- photosynthesis in plants
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
State whether the following statement is true or false. If false write the correct statement.
Melting of butter and wax are examples of chemical changes.
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
Select the chemical changes from the following list of changes
Drying of a fruit
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
Mention some of the different conditions needed for chemical changes to occur.
