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Olfactory indicators give signals in acids and bases based on what change?

Answer and explanation

Correct answer: Change in smell

Olfactory indicators are substances whose characteristic smell changes, becomes weak, or may disappear in acidic or basic media. The indicator therefore provides information through the sense of smell rather than through a colour change. Onion and vanilla are common school-level examples. Option A is correct. An indicator does not lose all mass, form a metal, or make water disappear merely because it is placed in an acid or base.

Related tags

Olfactory-IndicatorSmellAcid-BaseOnionVanillaAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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