Tipo de reacción
mg + o₂> mgo + 1199.66 kj

An exothermic combination reaction

Explanation:

There are two aspects to consider regarding this reaction, as it doesn't only provide the reaction but it also includes the enthalpy change for the reaction.

In terms of this reaction, magnesium atom combines with oxygen molecule to produce one product, magnesium oxide. This may be classified as a combination reaction.

Now, we also see that we released a total of 1199.66 kJ of heat as our product. There are two types of reactions in terms of the enthalpy change: exothermic reactions (those that release heat) and endothermic reactions (those that consume heat).

The enthalpy change for exothermic reactions is negative and it's positive for endothermic reactions.

However, here we're actually given heat as a product. If we have it as a product, this means heat was released into the surrounding by this reaction and we have an exothermic reaction.

i'm assuming that the correct answer is indeed the first one/ "a"..