What colour does phenolphthalein give in a basic solution?
Answer and explanation
Correct answer: Pink
Phenolphthalein is an acid–base indicator whose colour depends on the medium. It remains colourless in acidic or neutral conditions but changes to pink, often bright pink in a sufficiently basic solution. Therefore option B is correct. Colourless is associated with its acidic form, whereas red and green are not the standard phenolphthalein colour changes used in this test.
Frequently asked questions
What is the correct answer to this question?
Pink
Why is this the correct answer?
Phenolphthalein is an acid–base indicator whose colour depends on the medium. It remains colourless in acidic or neutral conditions but changes to pink, often bright pink in a sufficiently basic solution. Therefore option B is correct. Colourless is associated with its acidic form, whereas red and green are not the standard phenolphthalein colour changes used in this test.
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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