How do neutral, acidic and basic salt solutions respond to litmus test ?

What are neutral salts, acidic salts and basic salts. Give two examples each of neutral, acidic and basic salts.

(a) You are provided with three test tubes A,B,C which contain distilled water , acidic and basic solutions . If you are given blue litmus paper only , how will you identify the nature of the solutions in three tubes? (b) How will you prove that a given salt is a carbonate of a metal ?

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?