Chemistry Questions Help?

I have a chem quiz and i am having trouble figuring out how to do these problems, its only a few of them, I just cant seem to find how to do it

1. HCl will react with all except a) CH3COOH b) K c) CH3NH2 d) CaCO3

2. If the pH of solution is increased from 2 to 4, the [H3O] (increases by a)2 or b)100) or (decreases by c)2 or d)100

3. if some acid were added to a solution buffered by a mixture of Na2HPO4 and NaH2PO4, the acid would be buffered by what reaction?

Answer:
1 should be D.
2 is increase by 100.

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