Question

is neutralisation reaction is an endothermic or exothermic reaction?​

Answer 1

When an acid is neutralised by an alkali the reaction is exothermic. The other ions are spectators. Bond formation is an exothermic process hence the reaction is exothermic because bonds are being formed. The value of ΔH is positive i.e heat is taken in from the surroundings.

Answer 2

Acid base neutralization involves the formation of a salt and water. Such a process is inevitably exothermic.

Bond-breaking is endothermic, whereas bond formation is exothermic. Whether a given reaction is exothermic or endothermic depends on the balance between bond-breaking and bond-making.

In the generalized acid base reaction, as shown below, we form 2 substances, salt and water, whose formation should be intrinsically exothermic:

Acid+base→salt+water+energy

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