What colour does phenolphthalein become 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. In an acidic or neutral medium it remains colourless, but in a sufficiently basic medium it changes to pink. Therefore, the correct answer is option A, pink. Colourless, yellow, and blue do not represent the characteristic alkaline colour of phenolphthalein.
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. In an acidic or neutral medium it remains colourless, but in a sufficiently basic medium it changes to pink. Therefore, the correct answer is option A, pink. Colourless, yellow, and blue do not represent the characteristic alkaline colour of phenolphthalein.
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.
