Q. Blue litmus paper turns which color on contact with an acidic solution?
Answer: red
Notes: The litmus test is a quick method of determining whether a liquid or gaseous solution is acidic or basic (alkaline). Usually, litmus paper is either red or blue. Red paper turns blue when the pH is alkaline, while blue paper turns red when the pH turns acidic. If the paper turns purple, this indicates the pH is near neutral.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 91 in General Studies Mock Test - 75 in above course in App.