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 pH of the solution. In an acidic or neutral medium, it is generally colourless, but in a basic medium it changes to pink because its molecular form changes in the presence of hydroxide ions. Therefore, option A is correct. Red and yellow are not the characteristic colours of phenolphthalein, while colourless describes its acidic form.
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 pH of the solution. In an acidic or neutral medium, it is generally colourless, but in a basic medium it changes to pink because its molecular form changes in the presence of hydroxide ions. Therefore, option A is correct. Red and yellow are not the characteristic colours of phenolphthalein, while colourless describes its acidic form.
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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