What colour does phenolphthalein show in a basic solution?
Answer and explanation
Correct answer: Pink
Phenolphthalein is a synthetic acid–base indicator. It is colourless in an acidic or sufficiently neutral medium, but its indicator form becomes pink to reddish-pink in a basic solution. Since the question asks specifically about a basic solution, option B, pink, is correct. Colourless belongs to the acidic range, while blue and green are not the standard phenolphthalein result.
Frequently asked questions
What is the correct answer to this question?
Pink
Why is this the correct answer?
Phenolphthalein is a synthetic acid–base indicator. It is colourless in an acidic or sufficiently neutral medium, but its indicator form becomes pink to reddish-pink in a basic solution. Since the question asks specifically about a basic solution, option B, pink, is correct. Colourless belongs to the acidic range, while blue and green are not the standard phenolphthalein result.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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