In a solution, blue litmus turns red, but red litmus shows no change. What is the nature of the solution?
Answer and explanation
Correct answer: Acidic
The governing concept is the litmus indicator test. An acidic solution changes blue litmus to red because hydrogen ions interact with the indicator. Red litmus does not show a further colour change because it already has the acid-side colour. A neutral solution changes neither strip, and a base would turn red litmus blue. Therefore, option C is correct.
Frequently asked questions
What is the correct answer to this question?
Acidic
Why is this the correct answer?
The governing concept is the litmus indicator test. An acidic solution changes blue litmus to red because hydrogen ions interact with the indicator. Red litmus does not show a further colour change because it already has the acid-side colour. A neutral solution changes neither strip, and a base would turn red litmus blue. Therefore, option C is correct.
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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