Question

Reaction of quick lime (CaO) with water to produced slaked lime (Ca(OH)₂) is an example of

(a) displacement reaction

(b) endothermic reaction

(c) decomposition reaction

(d) exothermic reaction

Answer 1

(d) exothermic reaction

When water is added to quicklime, rise in temperature is observed. It is example of an exothermic reaction. Exothermic reaction is a reaction in which energy is released in the form of heat. 

Hence, when water is added to quicklime rise in temperature is observed this is example of exothermic reaction.