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If acid is slowly added to a basic solution, what change is expected near neutralisation?

Answer and explanation

Correct answer: pH will come near 7

The governing concept is acid-base neutralisation. A basic solution initially has a pH above 7 because hydroxide ions are present in greater effective concentration. As acid is added, hydrogen ions react with hydroxide ions to form water, so the basicity decreases. Near the neutralisation point, the pH approaches 7, making option A correct. The other choices contradict the direction of the pH change or describe an impossible transformation.

Related tags

NeutralisationPhBasic SolutionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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