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Onion juice is an example of which type of indicator?

Answer and explanation

Correct answer: Olfactory indicator

Onion juice is classified as an olfactory indicator because onion’s characteristic smell can change or become difficult to detect in different acid-base media. The indicator property is therefore sensed through smell rather than through a typical colour transition. Option A is correct. Onion juice is not a metal, radioactive, or temperature-only indicator; those descriptions do not explain its use in acid-base testing.

Related tags

OnionOlfactory-IndicatorNatural-IndicatorAcid-BaseClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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