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Onion and vanilla change smell in acids and bases. Such indicators are called:
AObservatory
BOlfactory
CObligatory
DOscillatory
Answer & Solution
Correct answer: B. Olfactory
1. These substances signal by their odour, not colour.
2. Indicators that work through smell have their own name.
3. They are olfactory indicators.
_Source: syllabus Science Class X, Chapter 2, Acids, Bases and Salts._
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