Answer: Option (1) is the correct answer.
Explanation:
A chemical reaction in which two or more reactant species combine together to result in the formation of a single compound is known as a combination reaction.
The given reaction shows [tex]Cl_{2}O_{5}[/tex] and [tex]H_{2}O[/tex] combine together to form single molecule of [tex]HClO_{3}[/tex].
Thus, we can conclude that it is a combination reaction.
