Can a decomposition reaction also be a combustion reaction? or are combustion reactions only limited to synthesis reactions that involve oxygen?
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Is not the same type of reaction

Explanation:

A combustion reaction is one that all the compounds reacts to the simple expression, for example, a moluce that have one atom of sulfure and both atom of carbono, in a aerobic combustion (with oxygen) the products are oxygen sulfure and carbon dioxide

In another hand, the descomposition reaction is a generic type, the "structure" of this type is: AB --> A+B, it would be a glucose degrade into the cicle of the citric acid

I hope you understand me

b is the correct

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.