Advertisements
Advertisements
Question
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
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
A is false but R is true
APPEARS IN
RELATED QUESTIONS
Classify the following as chemical or physical change:
Making a fruit salad with raw fruits
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 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 formade | e. irreversible change |
| f. slow change |
Chemical changes are accompanied by changes in energy.
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Write true or false
Melting of ice is a physical change.
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
What will you take into account while identifying the following?
A physical change in a substance.
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
