Question

which of vanilla onion and clove are olfact9ory indicators?

Answer 1

An Olfactory indicator is defined as a substance whose smell varies when it is mixed with an acidic or basic solution.Such substances can be used in the laboratory to test whether a solution is a base or an acid, and this process is called olfactory titration. All onion,clove oil and vanilla extract areexamples.
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Answer 2

they all are olfactory indicators