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Question

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

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Solution

Exothermic reactions Reactions which are accompanied by an evolution of heat are called exothermic reactions. The quantity of heat produced is shown along with the products with a '-' sign in terms of H. For e.g,
CaO(s)+CO2(g)CaCO3(g) H=178.3 KJ /mol

Endothermic Reactions Reactions which proceeds with the absorption of heat are called endothermic reactions. The quantity of heat absorbed is shown either along with the products with a '+' sign in terms of H. For e.g.,2NH3(g) N2(g) + 3H2(g) H=+91.8


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