If a solution turns red litmus blue and shows pH 10, what is the most correct conclusion?
Answer and explanation
Correct answer: It is basic
The governing concept is the identification of bases by indicators and the pH scale. A base changes red litmus to blue, while a neutral substance generally leaves it unchanged. Also, pH 10 is greater than 7, so the solution has alkaline character. Both observations lead to option C. Option A contradicts both tests, option B would fit pH 7, and the test gives no evidence that the sample is a gas.
Frequently asked questions
What is the correct answer to this question?
It is basic
Why is this the correct answer?
The governing concept is the identification of bases by indicators and the pH scale. A base changes red litmus to blue, while a neutral substance generally leaves it unchanged. Also, pH 10 is greater than 7, so the solution has alkaline character. Both observations lead to option C. Option A contradicts both tests, option B would fit pH 7, and the test gives no evidence that the sample is a gas.
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.
