Question

Phenolphthalein is

• A. yellow in acidic medium, pink in basic medium.
• B. pink in acidic medium, colorless in basic medium.
• C. colorless in acidic medium, pink in basic medium.
• D. pink in acidic medium, yellow in basic medium.

Answer 1

The correct option is C

colorless in acidic medium, pink in basic medium.

The explanation for the correct option (C):

• Phenolphthalein is an indicator which is used in acid-base titrations.
• This indicator is used to determine the endpoint of a titration.
• It is colorless.
• In acidic solutions, phenolphthalein is colorless while in basic medium, it changes its color to pink.

Final Answer: Hence, option (C) is correct. Phenolphthalein is colorless in an acidic medium, pink in a basic medium.