Which of the following indicators is an olfactory indicator?

Litmus

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Vanilla

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Turmeric

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Phenolphthalein

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Solution

The correct option is C Vanilla
Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. Onion, clove oil and Vanilla extract are examples.

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Which of the following(s) is/are olfactory indicators?

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