What colour does phenolphthalein show in a basic solution?
Answer and explanation
Correct answer: Pink
Phenolphthalein is an acid–base indicator whose colour depends on the nature of the solution. It remains colourless in an acidic medium but changes to pink, or pinkish-red in stronger alkaline conditions, in a basic medium. Thus option C is the standard school-level answer. Red, green, and colourless do not represent its usual basic-solution colour.
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 nature of the solution. It remains colourless in an acidic medium but changes to pink, or pinkish-red in stronger alkaline conditions, in a basic medium. Thus option C is the standard school-level answer. Red, green, and colourless do not represent its usual basic-solution colour.
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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