What is the most important chemical property that causes a molecule to be described as an acid?

a. Ability to accept protons

b. Presence of a Hydrogen atom

c. Ability to donate protons

d. Absence of an Oxygen atom

Answer: c. Ability to donate protons

Explanation:

An acid is a substance that consists of molecules or ion which is able to donate a proton in a solution. It is can form a covalent bond with an electron pair. It changes it's color in the presence of indicators such as it turns the blue litmus to red color. It reacts with the bases to form the salts. It promotes certain chemical reactions.