Question

the commonly used natura indicator which is extracted from lichen =​

Answer 1

Answer:

Litmus

Litmus: A natural dye

The most commonly used natural indicator is litmus. It is extracted from lichens (Fig. 5.1). It has a mauve (purple) colour in distilled water.

Answer 2

Answer:

Litmus paper

Explanation:

If the paper is blue, in the presence of acid, it turns red.

If the paper is red, in the presence of base, it turns blue.