Question

What is an olfactory indicator? Name two olfactory indicators. What is the effect of adding sodium hydroxide solution to these olfactory indicators?

Answer 1

Answer: Those substances whose odour or smell changes in acidic and basic solutions are known as olfactory indicators

Onion and vanilla extract are two olfactory indicators

In onion: if a basic solution of sodium hydroxide is added then the smell of onion cannot be detected

In vanilla extraxt: if a basic solution of sodium hydroxide is added then the characteristic odour of vanilla extract cannot be detected by us ..

Explanation:

Answer 2

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there are some substances whose odour changes in acidic or basic media these are called olfactory indicators

ex:- egg & vanilla