Which among the following changes are exothermic or endothermic in nature.
Dilution of sulphuric acid.

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Solution

Endothermic reactions are reactions where energy is absorbed in the form of heat. For example, the melting of ice cubes.
Exothermic reactions are reactions in which energy is released in the form of heat. For example, Rusting of iron.
Dilution of sulphuric acid: when sulphuric acid is diluted with water then in solution sulfate and hydronium ions are formed and heat is released.
$\underset{sulphuric acid}{H_{2} {SO}_{4} (l)} + \underset{water}{H_{2} O (l)} \to \underset{hydronium ion}{H 3 O^{+} (aq)} + \underset{sulphate ion}{{SO}_{4}^{2 -} (aq)} + heat$
It is a highly exothermic reaction because heat is released in the form of heat in this reaction.

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