The species which is best represented by a resonance hybrid having two contributing structures is A) nitric acid
Nitric acid has a planar structure. The nitric acid structure contains one hydroxyl group (OH) attached to a nitrogen atom via a single bond. This nitrogen atom that is attached to the hydroxyl group is also bonded to two oxygen atoms, with one single bond and one double bond. The double bond occurs in resonance between the two oxygen atoms, causing the nitric acid to have two resonance forms. In nitric acid, the oxygen atom bonded to nitrogen with a single bond has a -1 charge, and the nitrogen atom retains a +1 charge. This causes the nitric acid charge to have a net value of zero.
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