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प्रश्न
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
विकल्प
True
False
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उत्तर
False.
Correct Statement: Melting of ice is an endothermic, reversible physical change.
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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.
Sublimation is classified as a physical change. Why ?
Solve this crossword by using the clues that follow.
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
Is a change of state of matter – a physical or a chemical change. Give reasons.
Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
Select the chemical changes from the following list of changes
Respiration in mammals.
What type of energy changes is associated when ice melts?
When solute is dissolved in a solvent it forms a solution.
