An acid can be defined as a molecule or other species which can donate a proton or accept an electron pair in reactions.
(OR)
A substance with particular chemical properties including turning litmus red, neutralizing alkalis, and dissolving some metals; typically, a corrosive or sour-tasting liquid of this kind.
In the following question, out of the four alternatives, choose the word which is opposite in meaning to the given word and click the button correspondingto it.