What is the nature of a solution that turns blue litmus paper red?
Answer and explanation
Correct answer: Acidic
Litmus is an acid–base indicator with a characteristic colour change. Blue litmus turns red in an acidic medium because the indicator responds to the presence of excess hydrogen ions. A basic solution generally turns red litmus blue, while a neutral solution does not produce this acidic change. Therefore the solution described is acidic, making option A correct; “salty” describes neither a definite indicator response nor a guaranteed pH.
Frequently asked questions
What is the correct answer to this question?
Acidic
Why is this the correct answer?
Litmus is an acid–base indicator with a characteristic colour change. Blue litmus turns red in an acidic medium because the indicator responds to the presence of excess hydrogen ions. A basic solution generally turns red litmus blue, while a neutral solution does not produce this acidic change. Therefore the solution described is acidic, making option A correct; “salty” describes neither a definite indicator response nor a guaranteed 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.
