Question

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What do you mean by Olfactory indicators ?​

Answer 1

Answer:

olfactory indicator is a substance whose smell indicates whether it is mixed with acid or base.

Answer 2

Answer:

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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.