Olfactory indicators change their _____ in acidic or basic medium.

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Taste

Physical state

Colour

Odour

answer is C.

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Detailed Solution

Indicators are substances that tell or indicate whether the substance is acidic or basic in nature by showing some change in its physical properties.

Mostly indicators like phenolphthalein, methyl orange or litmus change their colour.

But specific indicators change their odour in acidic or basic medium. These indicators are known as Olfactory indicators.

For example- Onion, vanilla extract and clove oil.

Hence, Olfactory indicators change their odour in acidic or basic medium.

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