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प्रश्न
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
विकल्प
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
Classify the following changes as physical or chemical:-boiling
State whether the following is physical or chemical changes.
lightning —
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Ice kept in a beaker, slowly melts and turns into water. The water in the beaker on solidification is freezing turns back to ice. Give four reasons why the change from ice to water and water back to ice is considered a physical change.
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
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.
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
______ is the substance that is dissolved in a solvent.
Classify the following as physical or chemical properties
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
