What do you mean by Olfactory Indicators???
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Explanation:
Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid, a process called olfactory titration.
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Answer:
the indicator which tells about acid or base through changing smell. hope it helps you dear
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