In a solution, methyl orange becomes yellow and phenolphthalein becomes pink. What is the nature of the solution?
Answer and explanation
Correct answer: Basic
Indicator colours reveal the solution’s acid-base nature. Methyl orange is yellow in a basic or sufficiently less acidic medium, while phenolphthalein is pink in a basic medium, generally above its transition range. Since both observations are consistent with a basic solution, option C is correct. An acidic solution would make methyl orange red and phenolphthalein colourless; a neutral solution would not make phenolphthalein pink.
Frequently asked questions
What is the correct answer to this question?
Basic
Why is this the correct answer?
Indicator colours reveal the solution’s acid-base nature. Methyl orange is yellow in a basic or sufficiently less acidic medium, while phenolphthalein is pink in a basic medium, generally above its transition range. Since both observations are consistent with a basic solution, option C is correct. An acidic solution would make methyl orange red and phenolphthalein colourless; a neutral solution would not make phenolphthalein pink.
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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