Answer :
The answer is D.
This one is a bit tricky because it requires you to realize that H+ and OH- are, respectively, an acid and a base. That's why it's neutralization.
Answer: D. neutralization
Explanation:
1. Substitution reaction is defined as the reaction in which one atom replaces the other atom from the compound.
[tex]AB+C\rightarrow AC+B[/tex]
2. Saponification is a reaction in which fatty acids are made to react with alkalis to form sodium salt of fatty acids called as soaps.
3. Ionization is a type of chemical reaction in which a substance ionizes when dissolved in water.
[tex]AB\rightarrow A^++B^-[/tex]
4. Neutralization is a type of chemical reaction in which an acid reacts with base to produce salt and water.
[tex]BOH+HX\rightarrow BX+H_2O[/tex]
