When a material in the liquid state is vaporized and thencondensed to a liquid,

Question

When a material in the liquid state is vaporized and thencondensed to a liquid, the steps in the process are,respectively, A. exothermic and exothermic B. exothermic and endothermic C. endothermic and exothermic D. endothermic and endothermic Please EXPLAIN youranswer. When a material in the liquid state is vaporized and thencondensed to a liquid, the steps in the process are,respectively, A. exothermic and exothermic B. exothermic and endothermic C. endothermic and exothermic D. endothermic and endothermic Please EXPLAIN youranswer.

Explanation / Answer

   Exothermic reaction - Reaction in which heat is evolved       Endothermic reaction - Reaction in which heat isabsorbed    *Note - Reaction need not always be a chemical reaction, itmay be even physical, as in this case.    Clearly in the first step ( liquid is vapourised), heat isabsorbed, and in the second step (vapour is condensed to liquid),heat       is released.        Therefore, the correct answer is :       (C) endothermic and exothermic

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