The type of chemical reaction that occurs in
2KClO3 → 2KCl + 3O2 is decomposition reaction (answer B)
Explanation
Decomposition reaction- is type of chemical reaction that involves breaking down compound into smaller or individual elements.
KClO3 undergoes decomposition reaction and it is broken down into KCl and O2.
Mostly in decomposition reaction energy is involved to break down compounds.