Which of the following is an exothermic process?

Dilution of sulphuric acid

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Sublimation of dry ice

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Evaporation of water

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Melting of ice

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Solution

The correct option is A Dilution of sulphuric acid
A large amount of heat is released during the dilution of sulphuric acid.
$H_{2} S O_{4 (l i q)}$ $w a t e r ⟶ H_{2} S O_{4 (a q)} + h e a t$
Sublimation of dry ice, evaporation of water and melting of ice are endothermic reaction.
Hence, option $A$ is correct.

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