Red litmus turns blue in a base. What does this identify?
Answer and explanation
Correct answer: Basic nature
Red litmus is used to test whether a substance is basic. A base changes red litmus paper to blue, so the observed colour change identifies an alkaline or basic nature. Therefore option A is correct. Acids show the opposite response by changing blue litmus red, whereas a neutral solution generally does not produce this characteristic change. The test does not indicate whether a substance is gaseous.
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What is the correct answer to this question?
Basic nature
Why is this the correct answer?
Red litmus is used to test whether a substance is basic. A base changes red litmus paper to blue, so the observed colour change identifies an alkaline or basic nature. Therefore option A is correct. Acids show the opposite response by changing blue litmus red, whereas a neutral solution generally does not produce this characteristic change. The test does not indicate whether a substance is gaseous.
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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