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प्रश्न
Which of the following is a physical change?
पर्याय
Rusting of iron
Combustion of magnesium ribbon
Burning of candle
Melting of wax
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उत्तर
Melting of wax
Explanation:
Melting of wax is a physical change. All other changes are chemical changes.
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संबंधित प्रश्न
Fill in the blank.
Changes that occur in nature are called ........................
State whether the following is physical or chemical changes.
cutting wood into small pieces —
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 changes :
Breaking of a glass tumbler
State which of the following pertain to – chemical changes.
- Substance retains its identity.
- The change is permanent.
- No new substance is formed.
- Is easily reversible.
- Produces one or more new substances by a change in its composition.
- The change is temporary.
- The composition and properties of the original substance are not altered.
Select the chemical changes from the following list of changes
The occurrence of lightning.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
State whether the following statement is true or false:
Anaerobic bacteria digest animal waste and produce biogas.
The change of state of a substance from solid to liquid and liquid to gas is ______.
Which of the following is not a physical change?
