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प्रश्न
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
पर्याय
True
False
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उत्तर
False.
Dissolving of solute in a solvent is a physical change and rusting of iron is a chemical change.
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संबंधित प्रश्न
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
Write short answer.
What are man-made changes ?
State whether the following is physical or chemical changes.
water cycle in nature —
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
True or false
In a physical change no net energy change is involved.
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
Water is the universal solvent. Why?
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
