Question

What kind of reaction is slaking of lime?

Answer 1

Definition of combination reaction.

A chemical reaction in which two or more substances is called a combination reaction.

Definition of Exothermic reaction.

The reaction in which heat energy is evolved along with the products is called exothermic reaction.

$$\begin{gathered} ·{\text{When Calcium hydroxide(CaO) reacts with water (H}}_{2}O),Calciumhydroxide(Ca{\left(OH\right)}_2)isformed. \\ ·CaO(s)+H_{2}O(l)\to Ca{\left(OH\right)}_2(aq)+heat \\ ·\text{The above reaction is called slaking of lime.} \\ {\text{·Here calcium Oxide (CaO)combines with a water (H}}_{2}O).Thereforeitisanexampleofcombinationreaction. \\ ·\text{During this reaction large amount of heat is evolved. So this is an exothermic reaction.} \end{gathered}$$

Conclusion: Slaking of lime is an example for combination as well as an exothermic reaction.