Answers

2016-01-25T19:25:00+05:30
Olfactory indicators" are those indicators that help to identify whether the given solution is acidic or basic by changing their smell instead of colour as other indicators do.

olfactory indicator" implies that this is a compound whose can smell you can detect... vanilla, clove and onion are all olfactory indicators as these do not give their distinct odour in highly alkaline(basic) medium.
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