68th B.P.S.C. (Pre) 2023
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. Which of them will turn red litmus to blue?
aDistilled water
bAcid
cBase✓ Correct
dMore than one of the above
eNone of the above
Explanation
In an acidic medium, red litmus does not change color. In a basic medium, red litmus turns blue, and in a neutral medium, neither red nor blue litmus changes colour.
general-science