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A question says acids and bases should be identified only by colour. What is the most correct exam-based answer?

Answer and explanation

Correct answer: Colour alone is not enough and indicators or pH paper should be used

The governing idea is that the colour of a substance alone is not a reliable chemical test. Many acids and bases are colourless, and the colours of solutions can vary for reasons unrelated to acidity or basicity. Litmus, universal indicator, or pH paper gives an observable response linked to hydrogen-ion concentration and pH. Therefore option A is the scientifically safe and exam-correct answer. Options B and C make unjustified generalisations, while D rejects a useful measurement.

Related tags

IndicatorsPh PaperAcid Base IdentificationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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