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प्रश्न
Write true or false
Rusting of iron is a chemical change.
विकल्प
True
False
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उत्तर
True
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संबंधित प्रश्न
Write true or false for the statement
A natural change can also be a desirable change
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
What is a chemical change ? Give two examples of chemical changes.
Classify the following as a physical or a chemical change.
Burning of coal
State why addition of sodium chloride to water is considered a physical change, while addition of dilute sulphuric acid to zinc is considered a chemical change.
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
Match the following
| Sr. No. | A | B | C |
| 1. | Melting | Change of state from liquid to solid | Ticking of clock |
| 2. | Condensation | Change of state from liquid to gas | Formation of ice cube |
| 3. | Evaporation | Change of state from solid to liquid | Collecting flowers |
| 4. | Freezing | Change of state from gas to liquid | Ice cube to water |
| 5. | Periodic change | Occurs at irregular time intervals | Water to steam |
| 6. | Non-periodic change | Occurs at regular time intervals | Steam to water drops |
The change of state of a substance from solid to liquid and liquid to gas is ______.
