Question

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are

• A. red and blue
• B. blue and red
• C. pink and colourless
• D. colourless and pink

Answer 1

The correct option is D

colourless and pink

Explanation:

Option (D): Colourless and pink.

• Phenolphthalein is an organic compound with the chemical formula ${\mathrm{C}}_{20}{\mathrm{H}}_{14}{\mathrm{O}}_4$
• It is a synthetic indicator used to test the acidic and basic nature of the solution.
• In acidic medium phenolphthalein remains colourless.
• in the basic medium, the phenolphthalein turns pink.

So, Option (D) is correct.