Concept:Quicklime reacts with water in an exothermic reaction, releasing heat energy.
Explanation:Quicklime is calcium oxide,
CaO.
When added to water, it reacts vigorously to form slaked lime, which is calcium hydroxide,
Ca(OH)2.
The reaction is:
CaO(s)+H2O(l)→Ca(OH)2(aq)+heatThis is an exothermic process because energy is released as heat.
The temperature of the mixture increases, showing that heat is evolved.
No gas is liberated during this reaction.
Therefore, the correct option is the one that states heat is evolved.
Answer:B. heat is evolved