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प्रश्न
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
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उत्तर
Physical change: Sublimation of a solid, making a fruit salad from raw fruits, formation of clouds, and dissolution of carbon dioxide in water Chemical change: Decomposition of water into hydrogen and oxygen by passing electric current (electrolysis)
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संबंधित प्रश्न
Classify the Following as a Physical Or a Chemical Change.
Formation of Clouds
Distinguish between the following.
Physical change and chemical change
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical 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.
What is the difference between dissolution of sugar and burning of sugar ?
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
Gas exists in three states as solid, liquid, and gas.
When solute is dissolved in a solvent it forms a solution.
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.
