Exothermic reactions : The chemical reactions which proceed with the evolution of heat energy are called exothermic reactions. The heat energy generated during the reactions is indicated by writing +q or more precisely by giving the actual numerical value on the products side. In common exothermic reactions may be represented as, A+B→ C+D+q(heat energy)
In exothermic reactions the enthalpy of the products will be less than the enthalpy of the reactants, so that enthalpy change is negative as shown as follows
Examples : (i) 
or 
(ii) 
(iii) Fermentation is also the example of exothermic reaction.
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