Question

What type of reaction is the reaction of quick lime with water?

Answer 1

We need to know that the quick lime is a common name for compound calcium oxide. It is a white, caustic, alkaline, crystalline solid at room temperature. Both it and a chemical derivative (calcium hydroxide, of which quicklime is the base anhydride) are important commodity chemicals.

Complete answer:
When water is added to quicklime, a rise in temperature is observed. This is an example of an exothermic reaction.
An exothermic reaction is a reaction in which energy is released in the form of light or heat. Thus, in an exothermic reaction, energy is transferred into the surroundings. In an exothermic reaction, the change in enthalpy $\left( {\Delta H} \right)$ will be negative. When quicklime is added to water, it forms slaked lime along with the evolution of heat. There will be a rise in the temperature of the bucket. Calcium oxide reacts with water to form calcium hydroxide, also called slaked lime.
$CaO + {H_2}O \to Ca{\left( {OH} \right)_2}$
The reaction that is carried out between calcium oxide and water and a single product that is calcium hydroxide is formed, is a type of combination reaction. As simply two molecules or compounds are reacting to produce a new product.

Note:
We need to know that there are many types of reactions that include combination, displacement, double displacement and many more. Combination reactions are the simple one in which reactants react together to form a product while in other reactions like displacement reaction; the ions get displaced from the reactants and new products are formed with that exchange of ions.