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प्रश्न
State which of the following pertain to – chemical changes.
- Substance retains its identity.
- The change is permanent.
- No new substance is formed.
- Is easily reversible.
- Produces one or more new substances by a change in its composition.
- The change is temporary.
- The composition and properties of the original substance are not altered.
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उत्तर
The following points pertain to chemical changes:
b. The change is permanent.
e. Produces one or more new substances by change in its composition.
The remaining points pertain to physical changes.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
State the various conditions that favour the process of evaporation.
Which of the following are physical changes and which are chemical changes ?
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
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.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
