Question

Which of these - vanilla, onion and clove, can be used as olfactory indicators?

Answer 1

Answer:

The correct answer is onion and vanilla essence.

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Answer 2

Answer: onion, clove oil, and vanilla extract

Explanation:

Olfactory indicatior is a substance whose smell varies depending on whether it’s mixed with an acidic or basic solution. Onion, clove oil, and vanilla extract are examplea.