In a solution, pH paper becomes deep red and blue litmus turns red. What is the safest conclusion?
Answer and explanation
Correct answer: The solution is strongly acidic
Blue litmus turning red is the standard indication of an acidic solution. Deep red on pH paper generally corresponds to a very low pH, indicating strong acidity rather than neutrality or basicity. Taken together, the observations support the conclusion that the solution is strongly acidic. The result does not prove that it contains only one substance or only salt, so option A is the safest and best answer.
Frequently asked questions
What is the correct answer to this question?
The solution is strongly acidic
Why is this the correct answer?
Blue litmus turning red is the standard indication of an acidic solution. Deep red on pH paper generally corresponds to a very low pH, indicating strong acidity rather than neutrality or basicity. Taken together, the observations support the conclusion that the solution is strongly acidic. The result does not prove that it contains only one substance or only salt, so option A is the safest and best answer.
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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