Question

(a) What is an indicator ? Name three common indicators.
(b) Name the acid-base indicator extracted from lichen.
(c) What colour does the turmeric paper turn when put in an alkaline solution ?

Lakhmir Singh Chemistry Class 10

Answer 1

a) Indicators are substances that determines which solution is acidic or basic. They helps in knowing which is acid and which is base
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