______ is a substance of which smell varies depending on whether it is mixed with an acidic or a basic solution.

Gustatory indicator

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Olfactory indicator

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Natural indicator

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Synthetic indicator

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Solution

The correct option is B Olfactory indicator
An olfactory indicator is a substance of which smell varies depending on whether it is mixed with an acidic or a basic solution. Vanilla, clove and onion are olfactory indicators.
Gustatory indicator are substances that can change its taste depending on their reaction with acid or base. Tongue is an example of gustatory indicator.

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