Final answer:
A chemical reaction with the general formula AB -> A+B is classified as a combination reaction, also known as a synthesis reaction, where two or more substances combine to form a single new substance.
Step-by-step explanation:
The chemical reaction with the general formula AB -> A+B is best classified as a combination reaction. In a combination reaction, two or more substances combine to form a single new substance.
The general form of a combination reaction is A+B -> AB. This type of reaction is also known as a synthesis reaction.