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प्रश्न
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
पर्याय
released
absorbed
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उत्तर
The energy required for completion of a physical change is released when the change is reversed.
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संबंधित प्रश्न
Classify the following changes as physical or chemical:- melting of a solid (wax)
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
Classify the following as physical or chemical change :
Condensation of steam
Give four difference between physical and chemical changes.
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
Select the chemical changes from the following list of changes
Butter turning rancid
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
Match the items of Column I with the items of Column II.
| Column I | Column II | ||
| (a) | Large crystals | (i) | Turns lime water into milky |
| (b) | Depositing a layer of zinc on iron | (ii) | Physical change |
| (c) | Souring of milk | (iii) | Rust |
| (d) | Carbon dioxide | (iv) | Sugar candy (Mishri) |
| (e) | Iron oxide | (v) | Chemical change |
| (f) | Dissolving common salt in water | (vi) | Galvanisation |
Keeping a stone in sunlight for few hours is ______.
