A chemical reaction that has the general formula of AB - A+B is best classified as a

reaction.

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Decomposition reaction

Explanation:

A chemical reaction that has the general formula of AB → A+B is best classified as a Decomposition reaction.

General equation;

AB → A + B

It is the reaction in which one reactant is break down into two or more product.

For example:

2NaCl → 2Na + Cl₂

Sodium chloride is ionic compound. It is made of two constituents sodium and chloride. When it decompose it gives its constituents element sodium and and chlorine.

Another example:

2Al₂O₃ → 4Al + 3O₂

Aluminium oxide decompose and gives its constituent elements aluminium and oxygen.