Which of the following is commonly used as an olfactory indicator?
Vanilla essence
Olfactory indicators are substances whose smell changes in acidic or basic conditions, allowing detection by smell rather than colour change.
Vanilla essence, onion, and clove oil are common olfactory indicators because their characteristic smell disappears or changes when mixed with a base.
Litmus, methyl orange, and phenolphthalein are visual (colour-change) indicators, not olfactory ones.
Hence, this is the correct answer.
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