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Which of the following substances is an olfactory indicator?

Answer and explanation

Correct answer: Onion

An olfactory indicator is identified through a change in smell rather than a change in colour. Onion is an olfactory indicator because its characteristic smell is affected by the nature of the medium and may be detected differently in acidic and basic conditions. Turmeric, litmus and phenolphthalein are colour indicators; they show changes through colour. Thus, onion, option B, is the correct answer.

Related tags

Acids And BasesIndicatorsOlfactory IndicatorOnionLitmusAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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