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  • What do you understand by exothermic reaction and endothermic reaction? Give one example of each type.

What do you understand by exothermic reaction and endothermic reaction? Give one example of each type.

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Exothermic Reaction : \Delta H  is negative for reactions which heat evolves during the reaction and are called exothermic. Example: CaO+CO_{2}\rightarrow CaCO_{3}

 This reaction leads to the release of -178.3 kJ mol-1 of energy and is an exothermic reaction as \Delta H is negative.

Endothermic Reaction : \Delta H is positive in an endothermic reaction which absorbs heat from the surroundings

 Example: 2NH_{3}\rightarrow N_{2}+3H_{2}

This reactions requires the energy of +91.8 kJ mol-1  and is an endothermic one because \Delta H is positive.

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