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A solution giving blue colour with universal indicator turns green after acid is added. What does this mean?

Answer and explanation

Correct answer: The solution changed from basic to nearly neutral

The governing concept is the pH colour scale of a universal indicator. Blue generally represents a basic solution, while green is near neutral, around pH 7. When acid is added, hydrogen-ion concentration increases and the basic character is reduced. Thus the solution moves from basic toward neutral, making option A correct. Option B predicts the opposite change, and C would require a strongly acidic colour rather than green.

Related tags

Universal IndicatorNeutralisationPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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