allerySubstances whose odour changes in acidic or basic media are called:
ANatural indicators
BSynthetic indicators
COlfactory indicators
DAcid-base indicators
Answer & Solution
Correct answer: C. Olfactory indicators
1. Indicators whose smell changes in acidic or basic solutions are a special class.
2. Substances like onion and vanilla extract change their odour in acids and bases.
3. These are called olfactory indicators.
_Source: RRB Group D CEN-02/2018 PYQ, Q.27._
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