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प्रश्न
Write true or false
Rusting of iron is a chemical change.
पर्याय
True
False
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उत्तर
True
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
Fill in the blank
Heat is ________ by a gas during the process of condensation.
What are man-made changes ?
Classify the following as physical or chemical change :
Formation of curd from milk
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
When ice melts to form water, change occurs in its
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 |
Grinding of wheat grain changes its size. It is a ____________ change.
Mention a few physical properties of a substance.
