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प्रश्न
Fill in the blank
Heat is ________ by a gas during the process of condensation.
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उत्तर
Heat is released by a gas during the process of condensation.
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संबंधित प्रश्न
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
Write short answer.
Give an example of desirable change which can also be undesirable
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Classify the following as physical or chemical change :
Growth of a plant
Which of the following are physical changes and which are chemical changes?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.
Ammonium chloride is also a sublimable solid. Give a reason why the sublimation of ammonium chloride involves a physical and a chemical change.
State why addition of sodium chloride to water is considered a physical change, while addition of dilute sulphuric acid to zinc is considered a chemical change.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
Sublimation of Iodine is a ______.
What kind of change is shown by tearing of paper?
