I could imagine different scenarios for this. My first inclination is that no reaction should take place. I could also imagine this is some kind of industrial process in which those are the raw ingredients in which these are simply heated together. Who would have thought hydrogen gas could be produced by heating water (as in a nuclear reactor) or that methane could produced from heating coal and water together?
What is the "carboxylic acid is made to react with ammonia in the presence of conc. sulfuric acid" reaction?