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प्रश्न
Which of the following are physical changes and which are chemical changes ?
Freezing of water
विकल्प
Physical change
Chemical change
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उत्तर
Freezing of water – Physical change
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संबंधित प्रश्न
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
Fill in the blank.
An earthquake is a .................. change.
Write true or false for the statement
Decomposition of leaves is a fast change.
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
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
Wood to sawdust:______:: Wood to Ash: Chemical change
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
State whether the following statement is true or false:
Anaerobic bacteria digest animal waste and produce biogas.
Match the items of Column I with the items of Column II.
| Column I | Column II | ||
| (a) | Large crystals | (i) | Turns lime water into milky |
| (b) | Depositing a layer of zinc on iron | (ii) | Physical change |
| (c) | Souring of milk | (iii) | Rust |
| (d) | Carbon dioxide | (iv) | Sugar candy (Mishri) |
| (e) | Iron oxide | (v) | Chemical change |
| (f) | Dissolving common salt in water | (vi) | Galvanisation |
Iron pipes coated with zinc do not get rusted easily.
