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Question

What are exothermic and endothermic reactions? Give examples.

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Solution

Exothermic reactions: Those reactions in which heat is evolved are known as exothermic reactions. An exothermic reaction is indicated by writing “+ Heat” on the product's side of an equation
Example:
(i) C(s)+O2(g)CP2(g)+Heat
(ii) N2(g)+3H2(g)2NH3(g)+Heat
Endothermic reactions: Those reactions in which heat is absorbed are known as endothermic reactions. An endothermic reaction is usually indicated by writing “– Heat” on the product side of a chemical equation
(i) C(s)+2S(s)CS2(I)Heat
(ii) N2(g)+O2(g)2NO(g)Heat

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