Question

Litmus is a indicator which is obtained from ​​.

• A. fungi
• B. natural
• C. synthetic
• D. lichens

Answer 1

Answer: (B), (D)

The correct options are
B natural
D lichens

Litmus is a natural indicator which is extracted from lichens. It is a purple coloured dye which is used as a visual indicator to identify acids and bases. Litmus is widely used in form of two types of papers:
1) Red litmus, which turns to blue in basic solution.
2) Blue litmus, which turns to red in acidic solution.