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A solution has pH 9. Acid is added and the pH becomes 7. What reaction has occurred?

Answer and explanation

Correct answer: Neutralisation

The governing concept is acid-base neutralisation. A pH of 9 indicates that the original solution is basic. Adding acid supplies hydrogen ions, which react with hydroxide ions or other basic species and reduce the basicity. When the pH reaches 7, the solution is approximately neutral under the stated conditions. Therefore option C is correct; displacement, combination, and decomposition are not identified by this pH change.

Related tags

NeutralisationPhAcid BaseAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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