Which of the following is(are) an endothermic process(es)?
(i) Dilution of sulphuric acid
(ii) Sublimation of dry ice
(iii) Condensation of water vapours
(iv) Evaporation of water
Reaction in which energy is absorbed is known as endothermic reaction. Hence, sublimation of dry ice and evaporation of water are endothermic reactions as they both involve adsorption of heat.