Olfactory indicators change their on addition of an acid or a base to it.

state

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colour

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smell

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Solution

The correct option is C smell
An olfactry indicator is a natural or a synthetic chemical that changes odour when it interacts with a base or an acid.
For example, onions and cloves change their odour when they come in contact with a base.

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Olfactory indicators with examples and their changes when react with acid or base

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