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Which of the following substances is used as an olfactory indicator?

Answer and explanation

Correct answer: Vanilla essence

Vanilla essence is an olfactory indicator because its odour remains detectable in an acidic or neutral medium but is not detected in a basic medium. Litmus, phenolphthalein, and methyl orange are colour-change indicators, not olfactory indicators. Exam tip: an indicator identified by a change or loss of smell is an olfactory indicator.

Related tags

Acids Bases SaltsOlfactory IndicatorsVanilla EssenceChemical IndicatorsClass 10 Science

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