AP Chemistry Problems. Check it out Please?

I will guess, but check it out to see if I'm right, a.&b. are false because it is physically impossible, c. sounds right because H has only one proton ,one e- and no neutron and there is less of it to begin with, d. sounds right because kinetic is sitting still and H is always found to be H2, never by itself "diatomic" and O is equally negitive-- O-2, e. I could not say for sure, but no, H would be faster because it is lighter. And last I think C. is the answer because everything else seems to be soluble in water