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प्रश्न
Define exothermic reactions. Give two examples of each.
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उत्तर
Exothermic reactions: The chemical reaction in which heat is given out is called exothermic reactions. It causes rise in temperature. .
e.g. (i) When carbon bums in oxygen to form carbon dioxide, a lot of heat is produced.
C + O2 → CO2 + heat.
When water is added to quicklime a lot of heat is produced which boils the water.
CaO + H2O → Ca (OH)2 + Heat.
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संबंधित प्रश्न
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Give an example with a balanced equation, of the following reaction:
exothermic reaction
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Select the correct answer from the options given below:
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Respiration is a ______ change.
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| Colum I | Column II | ||
| 1. | Alloying | a. | Exothermic change |
| 2. | Crystallization | b. | Periodic change |
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| 4. | Seasonal changes | d. | Pure solid |
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While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
Give scientific reasons.
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