Which of the following is an endothermic process?
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A.
Evaporation of water
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B.
Dilution of sulphuric acid
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C.
Sublimation of dry ice
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D.
Both sublimation of dry ice and evaporation of water
Correct Answer:
D. Both sublimation of dry ice and evaporation of water
Explanation:
Both the evaporation of water and the sublimation of dry ice are endothermic processes because they require the absorption of thermal energy from the surroundings to overcome intermolecular forces. During evaporation, liquid water absorbs heat to transition into a gaseous state. Similarly, sublimation involves solid carbon dioxide (dry ice) absorbing heat to change directly into a gas without passing through a liquid phase. In contrast, the dilution of sulfuric acid is an exothermic process that releases significant heat. Therefore, since both evaporation and sublimation absorb energy, the correct option is the one that includes both.
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