Which of the following is not an example of olfactory indicator?

Turmeric

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Vanilla

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Onion

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Clove

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Solution

The correct option is A Turmeric
Substances which change their smell when mixed with an acid or base are known as olfactory indicators. For example- onion, vanilla, clove, etc.

But turmeric on the other hand, is an example of visual indicator. It changes colour rather than changing its smell when mixed with an acid or base. Hence, it is not an example of olfactory indicator.

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