AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(c) Turmeric
Turmeric is a natural acid-base indicator. Methyl orange and phenolphthalein are synthetic indicators, while universal indicator is a mixture of several synthetic indicators.
Source: Chapter 2, Introduction
The textbook explicitly states: "Litmus is a natural indicator, turmeric is another such indicator." Methyl orange and phenolphthalein are mentioned as synthetic indicators. Universal indicator is also synthetic (a mixture of dyes). Examiners expect students to know the distinction between natural and synthetic indicators.