All combination reactions are exothermic but all exothermic reactions are not combination reaction .comment
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Answers
the fact is that when there is a bond formation energy is released and when a bond breaks energy is absorbed
energy is also released when nutralisation happens and also when it appears to happen
neutralisation appears to happen when a strong acid/base reacts with water .In that case water appears to be a base/acid respectively
as all combination reaction the bond formation is larger than breaking of bonds they are exothermic in nature
ex CaO + H₂O → Ca(OH)₂
but reactions like NaOH + HCl → NaCl + H₂O are also exothermic
the underlining fact is that if the amount of bond formation is greater than the amount breaking bond then the reaction is exothermic
NOTE : amount of bond formation does not mean the numerical number of bonds formed
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