Q. The substances whose odour changes in acidic or basic media are called _.

A
Olfactory indicators
B
Alkali Indicators
C
Veteri Indicators
D
Acidyl Indicators
Solution:

Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid, a process called olfactory titration. Onion , clove oil and vanilla extract are examples.

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