Correct Answer: Thyme leaves
Subject: chemistry
Explanation: • <b>Key Fact</b> Thyme leaves are herbs used for culinary and medicinal purposes, not as pH indicators. • <b>Supporting Detail</b> Petunia, Geranium, Hydrangea, and Red Cabbage contain a pigment called Anthocyanin, making them natural indicators. • <b>Related Concept</b> Turmeric is also a natural indicator (turns red in base). • <b>Why wrong options are wrong</b> The question asks for the odd one out; Thyme lacks indicator pigments. • <b>Exam Trick</b> Remember 'TRPHG' - Turmeric, Red cabbage, Petunia, Hydrangea, Geranium as natural indicators. • <b>Additional Info</b> Olfactory indicators change odour, while these change colour.
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