Question

what is olfactory indicator​

Answer 1

Answer:

Those substances whose smell (or odour) change in acidic or basic solution are called olfactory indicator

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Answer 2

An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. ... Simply put, olfactory indicators are substances which have a different odour in acid and base solutions. For eg: Vanilla extract has a characteristic pleasant smell, onion and clove oil, etc.