I have attatched the structure. From that, can you work out the hybridization?
It isn't really right to say that the N in ammonia has a +3 charge. It has "oxidation state" +3. Oxidation state does not necessarily mean charge. The oxidation state +5 for HNO3 comes from: one electron donated from N to each of the four bonds, and then the plus charge on N takes it to +5.
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