Correct Answer: Phenolphthalein
Subject: chemistry
Explanation: • <b>Key Fact</b> Phenolphthalein is naturally a colorless solution. • <b>Supporting Detail</b> When placed in an acidic or neutral medium, it remains colorless (shows no colour change). • <b>Related Concept</b> It only turns pink when introduced to a basic (alkaline) environment. • <b>Why wrong options are wrong</b> Blue litmus turns red, Methyl orange turns red, Universal indicator turns red/orange in acids. • <b>Exam Trick</b> Phenol-pH-thalein: P-P = Pink in Base, Colorless in Acid. • <b>Additional Info</b> It is widely used as an endpoint indicator in acid-base redox titrations.
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