Which one among the following is an example of an olfactory indicator? [MCQ]

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in Chemistry, Combined Geo Scientist 2025, UPSC

Which one among the following is an example of an olfactory indicator?

[Combined Geo-Scientist (P) Examination-2025]

(a) Litmus

(b) Methyl orange

(c) Phenolphthalein

(d) Onion

Ans: Onion

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