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According to Arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. Further, acid and base reacts to form salt and water.
Consider following example.
HCl   +     H2O        →      Cl-         +      H3O+
here, HCl has donated a proton, hence it is an acid.
Now consider following reactionHCl     +      NaOH           ↔     NaCl      +        H2O
in this reaction, HCl donates proton, hence it is acid. On other hand, NaOH donates hydroxyl ion (i.e. OH-), hence it is a base.  

According to the Arrhenius theory a substance that yields hydrogen ions as the only ion in an aqueous solution is Acid.

What are acids?

Acids are those substances which are having pH range from 0 to 7.

According to the Arrhenius theory of acid and base, acids are those compounds which donate H⁺ ion or proton in the aqueous medium and bases are those substances which donate OH⁻ ion in the aqueous medium.

Example of Arrhenius acids are HCl, CH₃COOH, HNO₃, etc.

Hence, those substance which yields H⁺ ions is acids.

To know more about acids, visit the below link:

https://brainly.com/question/25148363