I'll attach an image of the question below, basically what happened is that we had this question, I didn't know the answer so I put anything I and got lucky. however, after the test the teacher tells us that there was a mistake in the question (still not sure what the mistake is but it could be that the equation should be 2CO+O2
as a result she didn't count the question... but I need the extra points
is there any plausible explanation as to how someone could get the correct answer? like I can say that I knew there was mistake and figured out what it was and solved it?