In which situation will blue litmus turn red?
Answer and explanation
Correct answer: When placed in vinegar solution
Vinegar contains acetic acid, so its aqueous solution is acidic. Acids turn blue litmus paper red because the indicator changes colour in an acidic environment; therefore option A is correct. Sodium hydroxide, soap solution, and lime water are basic substances or solutions and generally turn red litmus blue rather than changing blue litmus to red. Identifying the nature of each solution before applying the indicator rule avoids confusion.
Frequently asked questions
What is the correct answer to this question?
When placed in vinegar solution
Why is this the correct answer?
Vinegar contains acetic acid, so its aqueous solution is acidic. Acids turn blue litmus paper red because the indicator changes colour in an acidic environment; therefore option A is correct. Sodium hydroxide, soap solution, and lime water are basic substances or solutions and generally turn red litmus blue rather than changing blue litmus to red. Identifying the nature of each solution before applying the indicator rule avoids confusion.
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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