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. If you are given only red litmus paper, how will you identify the contents of each test tube?

Explanation

Take three small pieces of red litmus paper Put one drop each of the given solutions on these litmus papers
The liquid which turns red litmus into blue is a basic solution .
Divide the blue litmus paper so formed into two parts .Put one drop each of the other two liquids separately on these two pieces of limus paper .The solution which turns blue litmus paper . red is acidic solution.
The solution which turns blue litmus paper red is acidic solution .
The solution which turns does not affect the colour of litmus paper is water .