What colour does red litmus turn in a basic solution?
Answer and explanation
Correct answer: Blue
The governing concept is the litmus test for a base. A basic or alkaline solution changes red litmus to blue because the indicator responds to the presence of basic ions, commonly associated with OH⁻ in water. Red is the original colour of the test paper, whereas white and orange are not the standard outcomes. Therefore, the correct observation is blue, given in option B.
Frequently asked questions
What is the correct answer to this question?
Blue
Why is this the correct answer?
The governing concept is the litmus test for a base. A basic or alkaline solution changes red litmus to blue because the indicator responds to the presence of basic ions, commonly associated with OH⁻ in water. Red is the original colour of the test paper, whereas white and orange are not the standard outcomes. Therefore, the correct observation is blue, given in option B.
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.
