Phenolphthalein is pink and methyl orange is yellow in a solution. What is the nature of the solution?
Answer and explanation
Correct answer: Basic
Indicator colour ranges provide the governing evidence. Phenolphthalein is colourless in acidic or neutral conditions but becomes pink in a basic solution. Methyl orange is red in acidic medium and yellow in neutral to alkaline medium. Since both observed colours are consistent with a basic medium, the solution is classified as basic. A neutral solution would not make phenolphthalein pink, so option B is the unambiguous answer.
Frequently asked questions
What is the correct answer to this question?
Basic
Why is this the correct answer?
Indicator colour ranges provide the governing evidence. Phenolphthalein is colourless in acidic or neutral conditions but becomes pink in a basic solution. Methyl orange is red in acidic medium and yellow in neutral to alkaline medium. Since both observed colours are consistent with a basic medium, the solution is classified as basic. A neutral solution would not make phenolphthalein pink, so option B is the unambiguous answer.
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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