In a solution both red and blue litmus do not change colour. What is the most appropriate conclusion?
Answer and explanation
Correct answer: The solution may be neutral
The governing concept is the behaviour of acid–base indicators. An acid changes blue litmus to red, while a base changes red litmus to blue. If neither paper changes colour, the solution is consistent with a neutral solution, although this observation alone may not establish exact pH. It cannot prove a strong acid or base, and a solution is not necessarily a gas. Thus A is the most appropriate conclusion.
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What is the correct answer to this question?
The solution may be neutral
Why is this the correct answer?
The governing concept is the behaviour of acid–base indicators. An acid changes blue litmus to red, while a base changes red litmus to blue. If neither paper changes colour, the solution is consistent with a neutral solution, although this observation alone may not establish exact pH. It cannot prove a strong acid or base, and a solution is not necessarily a gas. Thus A is the most appropriate conclusion.
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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