(a) What is an indicator ? Name the three common indicators.

(b) Name an acid-base indicator extracted from lichen.

(c) What colour does the turmeric paper turn to when put in an alkaline solution ?

A) Indicators are substances that determines whether the solution is acidic or basic. Indicators help in knowing which is acid and which is base.

The three common indicators are:-
1) Litmus paper 2) Methyl orange 3) Methyl Red

b)Acid base indicator extracted from lichen is Litmus paper

c) Turmeric paper turns red in bases(alkaline) and no change in red