Correct Answer: Olfactory Indicator
Subject: chemistry
Explanation: • <b>Key Fact</b> Olfactory indicators are substances whose smell/odour changes depending on whether they are in an acidic or basic medium. • <b>Supporting Detail</b> Common examples of olfactory indicators include vanilla extract, onion, and clove oil. • <b>Related Concept</b> These are especially useful for visually impaired students in chemical laboratories. • <b>Why wrong options are wrong</b> Visual indicators like litmus or phenolphthalein change colour, not odour. • <b>Exam Trick</b> 'Olfactory' medically relates to the sense of smell (olfactory nerve). • <b>Additional Info</b> A Universal indicator, on the other hand, shows different colours at different concentrations of hydrogen ions on a pH scale.
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