Which of the following represents the general form of a decomposition reaction?

A decomposition reaction occurs when a compound breaks apart to form its constituent atoms. It looks like this:AB → A + B
A combustion reaction occurs when fuel and oxygen yield water and carbon dioxide.
A + O2 → H2O + CO2
A single replacement reaction occurs when one element replaces another in a single compound.AB + C → AC + B
A double replacement reaction (also called a metathesis reaction) occurs when the cations and anions switch between two reactants to form new products.AB + CD → AD + BC