Which of the following is example of synthetic indicator?
I. Methyl orange
II. Phenolphthalein
Show answer & explanation
Correct answer: C
Explanation
Synthetic indicators are chemical substances prepared in a laboratory and used to determine the acidic or basic nature of a solution.
Methyl orange and phenolphthalein are two prominent examples of such indicators.
In an acidic medium, methyl orange turns red, whereas in a basic medium, it imparts a yellow color.
On the other hand, phenolphthalein remains colorless in an acidic medium but exhibits a deep pink color in a basic medium.
These indicators are of immense importance in titration procedures within the field of chemistry.
Therefore, Option (C)—'Both I and II'—is the correct answer.