AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Phenolphthalein turns pink (magenta) in a basic solution.
Source: Acids, Bases and Salts (Chapter 2), Section 2.1.4
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Activity 2.6 in the textbook shows that when phenolphthalein is added to NaOH (a base), the solution turns pink. When acid is added and the base is neutralised, the pink colour disappears. Examiners accept either "pink" or "magenta" — both are correct. Do not write "red"; the exact word from the textbook activity is pink.