If a solution turns red litmus blue and turmeric reddish brown, what is its nature?
Answer and explanation
Correct answer: Basic
A base changes red litmus paper to blue because the solution provides a basic medium. Turmeric is also a natural indicator: it turns reddish brown in the presence of a base, while it generally remains yellow in acidic or neutral conditions. Since both independent tests indicate alkalinity, option B is correct. An acidic or neutral solution would not produce both changes, and being salty does not automatically mean that a solution is neutral.
Frequently asked questions
What is the correct answer to this question?
Basic
Why is this the correct answer?
A base changes red litmus paper to blue because the solution provides a basic medium. Turmeric is also a natural indicator: it turns reddish brown in the presence of a base, while it generally remains yellow in acidic or neutral conditions. Since both independent tests indicate alkalinity, option B is correct. An acidic or neutral solution would not produce both changes, and being salty does not automatically mean that a solution is neutral.
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.
