Question

These substances have different odour in acid and base


This is a answer not a question.
Answer of olfactory indicators

Answer 1

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Answer 2

Answer:

An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution.

eg =>>Onion: It loses its characteristic smell in Basic solution and retains its smell in Acidic solution.

Vanilla: It loses its smell in basic solution and retains its smell in Acidic solution.

Clove: Even clove loses its smell in basic solution and retain its smell in Acidic solution.