Q. Which of the following is/are correct for indicators?

1. Litmus is extracted from lichen.
2. Turmeric is yellow in acidic solution.
3. China rose indicator is magenta in water.

Select the correct answer from the codes given below:
Answer: Only 1 and 2
Notes: Special type of substances are used to test whether a substance is acidic or basic. These substances are known as indicators. The indicators change their colour when added to a solution containing an acidic or a basic substance. The most commonly used natural indicator is litmus. It is extracted from lichens. When added to an acidic solution, it turns red and when added to a basic solution, it turns blue. Turmeric is yellow in neutral solutions, yellow in acidic solutions and red in basic solutions. China rose indicator in water is pink, magenta in acidic solution and green in basic solution.