Question

The given reaction is an example of ______________________.
$KOH + HCl \to KCl + {H_2}O$
A. Combination reaction
B. Displacement reaction
C. Decomposition reaction
D. Neutralization reaction

Answer 1

We know that Potassium hydroxide is a base, hydrochloric acid is an acid and Potassium Chloride is a salt. The reaction that takes place in which reaction a base and an acid reacts and forms a salt and water in which acid is neutralized by base.

Complete solution:
First of all we will look at the reactions given in the options.
Combination Reaction: Combination reaction is a reaction in which two or more compounds react and form a single compound.
Example : $2{H_2} + {O_2} \to 2{H_2}O$
Displacement Reaction: Displacement reaction is a reaction in which one element is replaced by another element in a compound.
Example : $AgCl + Na \to NaCl + Ag$
Decomposition Reaction: Decomposition reaction is a reaction in which one compound breakdown and forms two or more products.
Example : $Ca{\left( {OH} \right)_2} \to CaO + {H_{_2}}O$
Neutralization Reaction: Neutralization reaction is a reaction in which an acid and a base react quantitatively with each other and form a salt and water.
In neutralization reaction heat is produced.
Example : $NaOH + HCl \to NaCl + {H_2}O$
In the given question we have
$KOH + HCl \to KCl + {H_2}O$
In the given reaction, Potassium hydroxide is a base, Hydrochloric acid is an acid and Potassium Chloride is a salt, hence the acid and base react to form water and salt so it is clearly a neutralization reaction.

Hence the correct option is (D).

Note: Some important facts about neutralization reaction are :
(i) In neutralization only acid and base participate.
(ii) If one gram-equivalent of acid reacts with one gram-equivalent of base then heat exhausted is known as neutralization energy.
(iii) Toothpaste contains bases that neutralize the acid produced by bacteria in our mouth.