The answer is none of the above. If you look at the reaction results, you'll notice that one of the products make are K2O. Because of this ratio, it's essentially impossible to balance this equation.
The type of chemical reaction is decomposition, as the compound is being broken down into other smaller compounds.
Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.
