Here's the answer key to the 2011 final exam. One thing to note: One page 4 where the resonance structures for CO3 are drawn out, you should draw arrows showing where the electrons move to make the next resonance structure. (i.e. draw an arrow from the electrons on one of the singly bonded oxygens showing the formation of a double bond, and draw a second arrow from the double bond forming a lone pair on the oxygen)
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