Question

which of the following is an olfactory indicator​

Answer 1

Phenolphthalein. Hint: Basically, an olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. Moreover, these indicators can be used in the laboratory to test whether a solution is a base or an acid.

Answer 2

Answer:

I) onion

II) vanilla extract

III) clove oil

are some examples of olfactory indicators.

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hope it helps