What are indicators? Explain in brief about the various types of natural indicators.

You are given two test tubes, one of which contains an acidic solution and the other contains a basic solution. If you are given only blue litmus paper, how will you identify the unknown contents of each test tube? Do not taste the contents of any of the test tubes! (Hint: Recall the litmus test).

You are given an unknown salt. How will you identify the nature of that salt, that is whether it is acidic, basic or neutral? (Hint: Recall the pH test).

Label the colour chart given below.