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Question
What do you understand by exothermic reaction and endothermic reaction? Give one example of each type.
Solution
Exothermic reaction: The reaction which is accompanied with evolution of heat is known as exothermic reaction.
\[\ce{CaO + CO2 -> CaCO3, ΔH= -178.3 kJ mol^{-1}}\]
Endothermic reaction: The reaction which is accompanied with absorption of energy is known as endothermic reaction, e.g.,
\[\ce{2NH3 -> N2 + 3H2; ΔH = + 91.8 kJ mol^{-1}}\]
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