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In an acid-base reaction, if an indicator stops changing colour, what condition may it indicate?

Answer and explanation

Correct answer: A condition near neutralisation

An acid-base indicator changes colour over a particular pH transition range. During gradual addition of one solution to another, a stable final colour can indicate that the mixture has reached or passed the indicator’s endpoint, often near the neutralisation point in a suitable titration. It does not prove an explosion, absence of water, or metal formation. Therefore option C is the appropriate conclusion, with the exact pH depending on the indicator used.

Related tags

NeutralisationIndicatorAcid-Base-ReactionTitrationClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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