what is exothermic and endothermic reaction?

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Solution

Dear student,

A chemical reaction which is accompanied by evolution of heat energy is known as exothermic reaction .
for ex : C + O₂ -------------- CO₂ + 393 kilojoule or KJ

A chemical reaction which is accompanied by absorption of heat energy is known as endothermic reaction .

for ex : 2HgO + energy --------- 2Hg + O_{2

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