I am not sure what is typical with regard to defiance or argumentativeness, but I suspect that some of it is inborn, some of it may be due to other disorders, and some of it comes from how the world reacts to these kids. No, stop, calm down, think before you act, stop, please stop, don't, ...you get the picture. A psychologist that we work with thinks that there are secondary behaviors that manifest themselves as a reaction to how the child's differences are initially and inappropriately dealt with. Instead of trying to structure things to take into these kids' real limitations and problems--particularly when they are young--we try to force them to conform to a world that they just don't have the ability to conform to. So we get reactions we don't like-anger, defiance, low self-esteem, etc.
Also for ADHD kids there is the theory that they often like to stir up trouble so to speak if life gets too boring--they are stimularing the understimulated brain that characterizes ADD kids, as counterintuitive as that may be.