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What is an exothermic reaction ? Give an...

What is an exothermic reaction ? Give an example.

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The process in which heat is given out is called an exothermic reaction.
When `NaOH_((s))` dissolves in water, there is evolution of heat leading to a rise in temperature .
`NaOH_((s)) + H_(2)O_((I))to NaOH_((aq)) + "Heat"`
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