A solution giving violet colour with universal indicator becomes blue when acid is added. What does this correctly mean?
Answer and explanation
Correct answer: Basicity decreased but the solution is still basic
The governing concept is the colour range of a universal indicator and neutralisation. Violet indicates a strongly basic medium, while blue represents a less strongly basic medium. Adding acid consumes some hydroxide ions and lowers the pH, but the remaining solution is still on the basic side of pH 7. Therefore option A is correct; it is not acidic, completely neutral, or unchanged.
Frequently asked questions
What is the correct answer to this question?
Basicity decreased but the solution is still basic
Why is this the correct answer?
The governing concept is the colour range of a universal indicator and neutralisation. Violet indicates a strongly basic medium, while blue represents a less strongly basic medium. Adding acid consumes some hydroxide ions and lowers the pH, but the remaining solution is still on the basic side of pH 7. Therefore option A is correct; it is not acidic, completely neutral, or unchanged.
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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