Which of the following is an endothermic process?
| (a)Dilution of sulphuric acid | (b)Sublimation of dry ice |
| (c)Condensation of water vapours | (d)Respiration in human beings |
"
Correct Answer: (b) Sublimation of dry ice
Explanation: Sublimation of ice is a direct phase transition from solid to gas without passing through an intermediate liquid state. This requires additional energy, hence, it is an endothermic reaction.
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