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प्रश्न
Give an example of the following chemical changes.
A reaction involving blue solution.
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उत्तर
\[\ce{\underset{[iron]}{Fe} + \underset{[blue solution]}{CuSO4_{(aq)}} ->\underset{[green solution]}{FeSO4} + \underset{(brown/red deposit)}{\underset{[copper]}{Cu}}}\]
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संबंधित प्रश्न
Define endothermic reactions. Give two examples of each.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Heat energy is evolved in these reactions
- Thermal decomposition reactions
- Exothermic reactions
- Endothermic reactions
- None of these
Explain the term with examples.
Endothermic reaction
Give scientific reason.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
Name a compound which produces carbon dioxide on heating.
State which type of chemical reaction proceeds with evolution of heat energy.
State the following reaction whether heat is evolved or absorbed –
Two neutral gases combine to give a basic gas.
Write an Explanation.
Endothermic reaction
Classify the following reaction into Exothermic and Endothermic reactions.
Magnesium ribbon when burned in air, it forms magnesium oxide.
Match the following:
| Colum I | Column II | ||
| 1. | Alloying | a. | Exothermic change |
| 2. | Crystallization | b. | Periodic change |
| 3. | Soap powder + water | c. | Mixing of molten solids |
| 4. | Seasonal changes | d. | Pure solid |
