Question

Olfactory indicator are those substance which give their natural odour or smell when they are dipped in acid or base solution.
In human being nose are the natural indicator and vanilla, onion and etc are the examples of olfactory indicators.
Mostly they are used in laboratory .​

Answer 1

Explanation:

An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid. Onion , clove oil and vanilla extract are examples

Answer 2

Answer:

• The substances or matters which change their odour after mixing with acid or bases are called as olfactory indicators.
• Human nose has the ability to detect the odour of the substance.
• These indicators tell us about the the nature of the substance or matter.
• Some examples are :- onion , clove oil and vanilla essence.
• But olfactory indicators can't be used always to determine the nature of the given substance.
• This may be hazardous sometimes.