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Since the amount of H3O has to be the greatest, then the compound has to be a strong acid. The given list contains hydrogen cyanide (HCN), which is a weakly acid, methanol (CH3OH), which is an alcohol, water (H2O), OH- (hydroxide) and nitric acid (HNO3), which is a toxic strong acid.
Therefore, the most acidic compound found in the provided list is HNO3.
Therefore, the correct option is b) HNO3.
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