If a solution turns red litmus blue and phenolphthalein pink, what is the nature of the solution?
Answer and explanation
Correct answer: Basic
Indicators provide the governing evidence for classification. A basic solution changes red litmus to blue, and phenolphthalein is pink in a basic medium. Since both independent observations indicate the same nature, the solution is basic and option B is correct. An acidic solution would turn blue litmus red and keep phenolphthalein colourless; a neutral solution would not produce these changes. Saltiness alone does not determine pH.
Frequently asked questions
What is the correct answer to this question?
Basic
Why is this the correct answer?
Indicators provide the governing evidence for classification. A basic solution changes red litmus to blue, and phenolphthalein is pink in a basic medium. Since both independent observations indicate the same nature, the solution is basic and option B is correct. An acidic solution would turn blue litmus red and keep phenolphthalein colourless; a neutral solution would not produce these changes. Saltiness alone does not determine 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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