Hydrochloric acid (HCl) contains hydrogen. I'm not familiar with hitrogen.
There is no neutrons in Hitrogen.
Nitric Acid
Vinegar contains a proportion of acetic acid.
You can find acids in fruits, for example Oranges this contains Citric acid
Lemon juice contains acid.
Dilute hydrochloric acid is an example of an acid solution commonly used in chemistry experiments and as a cleaning agent. It contains a lower concentration of hydrochloric acid compared to concentrated hydrochloric acid.
Stomach acid contains: Gastric Acid, Hydrochloric Acid (HCl), Potassium Cholride (KCl) and Sodium Chloide (NaCl)
A real world example of an acid is a lemon (a source of citric acid) or an aspirin (a derivative of salicylic acid).
A di-protic acid typically contains two H+ ions. An example would be H2SO4
Sulphuric acid contains sulphur, hydrochloric acid contains chlorine, nitric acid contains nitrogen, and ethanoic acid contains carbon.
You can find acids in fruits, for example oranges this contains Citric acid
The drug Augmentin, for example, contains a combination of amoxicillin and a betalactamase inhibitor, clavulanic acid.