Question

Name the acid base indicator extracted from lichen

Answer 1

Litmus paper is extracted from lichen. It indicates acid and bases. If the blue litmus turns red then the substance is acidic and when the red litmus turns blue then the substance is basic
Hope this will help u

Answer 2

Litmus , a natural dye is extracted from lichen.

Red litmus changes to blue in a basic solution whereas blue litmus changes to red in acidic medium