Achemical 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.

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the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.