If phenolphthalein is pink and methyl orange is yellow, what is the nature of the solution?
Answer and explanation
Correct answer: Basic
The governing concept is the colour response of acid–base indicators. Phenolphthalein becomes pink in a basic medium, while methyl orange is yellow in a neutral or basic medium and red in an acidic medium. Since both observed colours are consistent with a basic solution, option A is correct. An acidic solution would make methyl orange red, and insolubility is not a measure of pH.
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What is the correct answer to this question?
Basic
Why is this the correct answer?
The governing concept is the colour response of acid–base indicators. Phenolphthalein becomes pink in a basic medium, while methyl orange is yellow in a neutral or basic medium and red in an acidic medium. Since both observed colours are consistent with a basic solution, option A is correct. An acidic solution would make methyl orange red, and insolubility is not a measure of pH.
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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