Answer:
ans 1) an acid is 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.
ans 2) This involves reacting to an event after the event has already occurred. An example of that would be a teacher responding to a student cheating on an exam after the cheating has already occurred.
ans 3) a thing that is composed of two or more separate elements; a mixture.
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Explanation:
