Respuesta :
Hydrogen is the element which must be present in an acid.
What is Acid ?
Acids can be define as substance which can accept an electron pair and can donate a proton in a reactions. It is hydrogen containing substance. All the acids contains hydrogen.
Example: HCl (Hydrochloric Acid)
What is element ?
An element is a substance which is made up of only one type of atom and cannot be broken into simpler substance.
Thus, from the above conclusion we can say that Hydrogen is the element which must be present in an acid.
Learn more about the Acid here: https://brainly.com/question/25148363
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