Phenolphthalein turns pink and methyl orange turns yellow in a solution. What is the nature of this solution?
Answer and explanation
Correct answer: Basic
The governing concept is the characteristic colour range of acid-base indicators. Phenolphthalein is colourless in acidic or neutral solution but turns pink in a sufficiently basic solution. Methyl orange is yellow in neutral and basic conditions, so its yellow colour supports, but alone would not prove, basicity. Together the observations identify option A, a basic solution.
Frequently asked questions
What is the correct answer to this question?
Basic
Why is this the correct answer?
The governing concept is the characteristic colour range of acid-base indicators. Phenolphthalein is colourless in acidic or neutral solution but turns pink in a sufficiently basic solution. Methyl orange is yellow in neutral and basic conditions, so its yellow colour supports, but alone would not prove, basicity. Together the observations identify option A, a basic solution.
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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