1.

The observation of change in colour of clove oil vanilla essence and onion in the presence of acid and base

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ANSWER:

All onion,CLOVE oil and VANILLA extract are examples. An OLFACTORY indicator WORKS on the principle that when an acid or base is added to it,then different odour can be detected in bases whereas odour remains same in acids. Certain substances changes odour in acidic or basic medium

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