Red litmus turns blue in a solution. What nature does it show?
Answer and explanation
Correct answer: Basic
The governing concept is the litmus test for bases. Red litmus turns blue when it contacts a basic or alkaline solution, so the observed colour change identifies the solution as basic. Therefore option B is correct. An acidic solution turns blue litmus red, and a neutral solution generally produces no characteristic litmus change. Being salt-free is unrelated to this indicator result and cannot be concluded from the observation, so A, C, and D are incorrect.
Frequently asked questions
What is the correct answer to this question?
Basic
Why is this the correct answer?
The governing concept is the litmus test for bases. Red litmus turns blue when it contacts a basic or alkaline solution, so the observed colour change identifies the solution as basic. Therefore option B is correct. An acidic solution turns blue litmus red, and a neutral solution generally produces no characteristic litmus change. Being salt-free is unrelated to this indicator result and cannot be concluded from the observation, so A, C, and D are incorrect.
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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